Calculating the Average Cost

Oct 13, 2025 by wbrum.org 143 views

Introduction

Jo is a coffee lover who buys a cup of coffee every day. To calculate the average cost of Jo's coffee, we need to find the total cost of coffee for the week and divide it by the number of days. In this article, we will calculate the average cost of Jo's coffee for the week.

Given Data

Day	Cost
Mon	$5.32
Tues	$4.30
Wed	$4.87
Thurs	$4.11
Fri	?

Calculating the Average Cost

To calculate the average cost of Jo's coffee, we need to find the total cost of coffee for the week and divide it by the number of days. The total cost of coffee for the week is the sum of the cost of coffee for each day.

Step 1: Find the Total Cost of Coffee for the Week

To find the total cost of coffee for the week, we need to add the cost of coffee for each day.

Total Cost = Cost on Mon + Cost on Tues + Cost on Wed + Cost on Thurs + Cost on Fri

We know the cost of coffee for each day except for Friday. Let's call the cost of coffee on Friday "x".

Total Cost = $5.32 + $4.30 + $4.87 + $4.11 + x

Step 2: Calculate the Average Cost

To calculate the average cost, we need to divide the total cost by the number of days.

Average Cost = Total Cost / Number of Days

The number of days is 5.

Average Cost = ($5.32 + $4.30 + $4.87 + $4.11 + x) / 5

Simplifying the Equation

To simplify the equation, we can combine the constants.

Average Cost = ($18.60 + x) / 5

Finding the Value of x

To find the value of x, we need to know the average cost of Jo's coffee. However, the problem does not provide the average cost. Let's assume that the average cost is $4.50.

Step 3: Set Up the Equation

We can set up an equation using the average cost and the total cost.

Average Cost = Total Cost / Number of Days

$4.50 = ($18.60 + x) / 5

Step 4: Solve for x

To solve for x, we can multiply both sides of the equation by 5.

$4.50 \times 5 = $18.60 + x

$22.50 = $18.60 + x

Step 5: Subtract $18.60 from Both Sides

To isolate x, we can subtract $18.60 from both sides of the equation.

$22.50 - $18.60 = x

$x = $3.90

Conclusion

The cost of Jo's coffee on Friday would need to be $3.90 for the average cost of her coffee to be $4.50.

Average Cost Formula

The average cost formula is:

Average Cost = Total Cost / Number of Days

Total Cost Formula

The total cost formula is:

Total Cost = Cost on Mon + Cost on Tues + Cost on Wed + Cost on Thurs + Cost on Fri

Cost on Friday Formula

The cost on Friday formula is:

Cost on Fri = x

x Formula

The x formula is:

x = $22.50 - $18.60

x Value

The x value is:

x = $3.90

Average Cost Value

The average cost value is:

Average Cost = $4.50

Total Cost Value

The total cost value is:

Total Cost = $18.60 + x

Cost on Friday Value

The cost on Friday value is:

Q: What is the average cost of Jo's coffee?

A: The average cost of Jo's coffee is $4.50.

Q: How much would Jo's coffee need to cost on Friday for the average cost to be $4.50?

A: Jo's coffee would need to cost $3.90 on Friday for the average cost to be $4.50.

Q: What is the total cost of Jo's coffee for the week?

A: The total cost of Jo's coffee for the week is $18.60 + x, where x is the cost of coffee on Friday.

Q: How do you calculate the average cost of Jo's coffee?

A: To calculate the average cost of Jo's coffee, you need to find the total cost of coffee for the week and divide it by the number of days.

Q: What is the formula for calculating the average cost of Jo's coffee?

A: The formula for calculating the average cost of Jo's coffee is:

Average Cost = Total Cost / Number of Days

Q: What is the formula for calculating the total cost of Jo's coffee?

A: The formula for calculating the total cost of Jo's coffee is:

Total Cost = Cost on Mon + Cost on Tues + Cost on Wed + Cost on Thurs + Cost on Fri

Q: What is the formula for calculating the cost on Friday?

A: The formula for calculating the cost on Friday is:

Cost on Fri = x

Q: What is the value of x?

A: The value of x is $3.90.

Q: What is the total cost of Jo's coffee for the week if the cost on Friday is $3.90?

A: The total cost of Jo's coffee for the week is $18.60 + $3.90 = $22.50.

Q: How many days does Jo buy coffee?

A: Jo buys coffee for 5 days.

Q: What is the average cost of Jo's coffee if she buys coffee for 5 days?

A: The average cost of Jo's coffee is $4.50.

Q: Can you provide a step-by-step solution to the problem?

A: Yes, here is a step-by-step solution to the problem:

Find the total cost of coffee for the week.
Divide the total cost by the number of days to find the average cost.
Set up an equation using the average cost and the total cost.
Solve for x.
Find the value of x.

Q: Can you provide a formula for calculating the average cost of Jo's coffee?

A: Yes, the formula for calculating the average cost of Jo's coffee is:

Average Cost = Total Cost / Number of Days

Q: Can you provide a formula for calculating the total cost of Jo's coffee?

A: Yes, the formula for calculating the total cost of Jo's coffee is:

Total Cost = Cost on Mon + Cost on Tues + Cost on Wed + Cost on Thurs + Cost on Fri

Q: Can you provide a formula for calculating the cost on Friday?

A: Yes, the formula for calculating the cost on Friday is:

Cost on Fri = x

Q: Can you provide a formula for calculating the value of x?

A: Yes, the formula for calculating the value of x is:

x = $22.50 - $18.60