Problema Solution
. Gary's cellular phone bill averages $56.35 per month, based on a fixed fee of $29.95 and
$0.22 per minute of usage. The phone company has decided to reduce the per-minute
charge to $0.18. How much does this change save Gary in an average month?
Answer provided by our tutors
let
x = the number of minutes per month
the money that Gary spends per month before the reduction:
29.95 + 0.22*x = 56.35
lets find x
x = (56.35 - 29.95)/0.22
x = 120 min
after the reduction his bill will be
29.95 + 0.18*120 = 51.55
the difference is 56.35 - 51.55 = $4.8
another way to find the solution is to calculate the difference directly
29.95 + 0.22*120 - 29.95 - 0.18*120 = 0.04*120 = $4.8
after the change, in an average month, Gary will save $4.8.