The Original Price of the Phone

Oct 13, 2025 by wbrum.org 79 views

Understanding the Problem

The price of a phone decreases by 20%, and this decrease reduces the price of the phone by £150. We need to work out the original price of the phone before the decrease.

Let's Break Down the Problem

Let's assume the original price of the phone is £x. When the price decreases by 20%, the new price becomes 80% of the original price, which is 0.8x.

The Decrease in Price

The decrease in price is £150, which is 20% of the original price. We can set up an equation to represent this:

0.2x = 150

Solving for x

To solve for x, we need to divide both sides of the equation by 0.2:

x = 150 / 0.2 x = 750

The Original Price of the Phone

So, the original price of the phone before the decrease is £750.

Conclusion

In this problem, we used a simple equation to work out the original price of the phone. We assumed the original price was £x and set up an equation to represent the decrease in price. By solving for x, we found that the original price of the phone was £750.

Real-World Applications

This type of problem can be applied to real-world scenarios, such as:

Calculating the original price of an item after a discount
Determining the cost of a product before a price increase
Understanding the impact of inflation on prices

Tips and Tricks

When working with percentages, it's essential to remember that a 20% decrease is the same as a 20% discount.
To calculate the original price, you can use the formula: Original Price = (Decrease in Price / Percentage Decrease) x 100
Make sure to check your units and ensure that you're working with the correct currency.

Practice Problems

A shirt is on sale for £60, which is 20% off the original price. What is the original price of the shirt?
A company increases the price of a product by 15%. If the new price is £120, what was the original price?
A store offers a 25% discount on a pair of shoes. If the original price is £200, how much will you pay after the discount?

Solutions to Practice Problems

A shirt is on sale for £60, which is 20% off the original price. To find the original price, we can use the formula: Original Price = (Decrease in Price / Percentage Decrease) x 100 = (£60 / 0.2) x 100 = £300
A company increases the price of a product by 15%. If the new price is £120, we can set up an equation to represent the increase: 0.15x = 120, where x is the original price. Solving for x, we get x = 120 / 0.15 = £800
A store offers a 25% discount on a pair of shoes. If the original price is £200, we can calculate the discount amount: Discount = 0.25 x £200 = £50. The new price after the discount is £200 - £50 = £150.

Conclusion

In this article, we worked out the original price of a phone after a 20% decrease in price. We used a simple equation to represent the decrease in price and solved for the original price. We also discussed real-world applications of this type of problem and provided tips and tricks for working with percentages. Finally, we included practice problems and solutions to help readers understand and apply the concept.

Understanding the Problem

The price of a phone decreases by 20%, and this decrease reduces the price of the phone by £150. We need to work out the original price of the phone before the decrease.

Let's Break Down the Problem

Let's assume the original price of the phone is £x. When the price decreases by 20%, the new price becomes 80% of the original price, which is 0.8x.

The Decrease in Price

The decrease in price is £150, which is 20% of the original price. We can set up an equation to represent this:

0.2x = 150

Solving for x

To solve for x, we need to divide both sides of the equation by 0.2:

x = 150 / 0.2 x = 750

The Original Price of the Phone

So, the original price of the phone before the decrease is £750.

Q&A

Q: What is the formula to calculate the original price after a discount?

A: The formula to calculate the original price after a discount is: Original Price = (Decrease in Price / Percentage Decrease) x 100

Q: How do I calculate the percentage decrease?

A: To calculate the percentage decrease, you can use the formula: Percentage Decrease = (Decrease in Price / Original Price) x 100

Q: What is the difference between a discount and a decrease in price?

A: A discount is a reduction in the price of an item, while a decrease in price is the actual amount by which the price is reduced.

Q: Can I use this formula to calculate the original price of an item after a price increase?

A: Yes, you can use the same formula to calculate the original price of an item after a price increase. However, you will need to use the percentage increase instead of the percentage decrease.

Q: How do I calculate the percentage increase?

A: To calculate the percentage increase, you can use the formula: Percentage Increase = (Increase in Price / Original Price) x 100

Q: What if I don't know the original price of the item?

A: If you don't know the original price of the item, you can use the formula: Original Price = (Decrease in Price / Percentage Decrease) x 100 to calculate it.

Q: Can I use this formula to calculate the original price of an item after a sale?

A: Yes, you can use the same formula to calculate the original price of an item after a sale. However, you will need to use the percentage discount instead of the percentage decrease.

Q: How do I calculate the percentage discount?

A: To calculate the percentage discount, you can use the formula: Percentage Discount = (Discount Amount / Original Price) x 100

Conclusion

In this article, we worked out the original price of a phone after a 20% decrease in price. We also provided a Q&A section to help readers understand and apply the concept. We discussed real-world applications of this type of problem and provided tips and tricks for working with percentages. Finally, we included practice problems and solutions to help readers understand and apply the concept.

Practice Problems

A shirt is on sale for £60, which is 20% off the original price. What is the original price of the shirt?
A company increases the price of a product by 15%. If the new price is £120, what was the original price?
A store offers a 25% discount on a pair of shoes. If the original price is £200, how much will you pay after the discount?

Solutions to Practice Problems

A shirt is on sale for £60, which is 20% off the original price. To find the original price, we can use the formula: Original Price = (Decrease in Price / Percentage Decrease) x 100 = (£60 / 0.2) x 100 = £300
A company increases the price of a product by 15%. If the new price is £120, we can set up an equation to represent the increase: 0.15x = 120, where x is the original price. Solving for x, we get x = 120 / 0.15 = £800
A store offers a 25% discount on a pair of shoes. If the original price is £200, we can calculate the discount amount: Discount = 0.25 x £200 = £50. The new price after the discount is £200 - £50 = £150.

Real-World Applications

This type of problem can be applied to real-world scenarios, such as:

Calculating the original price of an item after a discount
Determining the cost of a product before a price increase
Understanding the impact of inflation on prices

Tips and Tricks

When working with percentages, it's essential to remember that a 20% decrease is the same as a 20% discount.
To calculate the original price, you can use the formula: Original Price = (Decrease in Price / Percentage Decrease) x 100
Make sure to check your units and ensure that you're working with the correct currency.