Question

A cell phone package charges $39 even if 0 minutes are used during the month. Each additional minute of talk time adds $0.07. What is the total cost if you talked on the phone for 10 hours during the month?

using the formal y = mx + b

Answer 1

total cost = $ 81

Explanation:

It is given that the fixed cost is $ 39

and the cost per minute is $0.07

Let us assume the number of minutes used be x

we have

total cost = cost per minute × number of minutes used + fixed cost

we plug the given values, so we have

`total cost = 0.07 x+39`

we need to find the total cost for 10 hours used

x= 10 hours = 10(60) minutes = 600 minutes

so we have total cost for x= 600 minutes

`total cost = 0.07(600)+39`

`total cost =42+39 = 81`

hence the total cost = $ 81