phone company charges fee of $50 per monthplus an additional $.10 for every minute of phone usage

Question

Celia was mis charged last month for her bill and 7% surcharge was mistakenly added to bill.

 

 

 

Which of the following linear functions represents the total cost for the previous month?

 

 

A. C = 0.07(50 + 0.1m)

 

B. C = 1.07(50 + 0.1m)

 

C. C = 0.07(50m + 0.1)

D. C = 1.07(50m + 0.1)

Answer 1

The corrected answer will be B because the linear function for total phone bill is C= 50 + 0.1m. 

Her last month bill was 7% surcharge so that the linear function for her total cost is C= 1.07 (50+ 0.1m)