Question

In January, the total cost for 150 minutes was $65 while in February, the total cost for 375 minutes was $87.5. The constant charge for each minute used is:

A. 0.1

B. 0.11

C. 0.12

Answer 1

After setting up a system of linear equations based on the given data for January and February, and solving for the constant charge per minute, we find that the charge is $0.10 per minute.

Step-by-step explanation:

To determine the constant charge for each minute used, we can set up a system of equations based on the information given. Let C be the constant charge per minute and F be the fixed cost regardless of the minutes used.

Setup:

For January (150 minutes): 150C + F = $65
For February (375 minutes): 375C + F = $87.5

Solving the System:

By subtracting the January equation from the February equation, we eliminate F and can solve for C.

225C = $22.5
C = $0.10

Thus, the constant charge for each minute used is $0.10.