Problema Solution
A phone company offers customers a choice of several monthly plans. Two of the simplest are plan A and plan B. Plan A has no monthly fee and charges 30 cents per minute. Plan B has a $10 monthly fee and charges 10 cents per minute. Suppose you choose plan B, and your bill last month was $34.60 (plus tax, but we ignore tax in this problem). For how many minutes did you use the phone?
Answer provided by our tutors
use the equation for plan B:
c = 10+.10m
your cost was 34.60. substitute this in and solve for m
34.60=10 +.10m
24.60=.10m
246 = m
You used the phone for 246 minutes