Question

There are 2 cell phone plans. Plan 1 gives a free phone, $1 per day used fee and then 8 cents per minute. Plan 2 gives a free phone as well, has a monthly fee of $10.00 and 18 cents per minute. If someone decides to use their phone for 15 days a month only, at what # of minutes do the plans cost the same?

Answer 1

15+8x=10+18x
5=10x
1/2=x
half minute huh?

Answer 2

that doesnt check though. i got 11.5 = 14

Answer 3

hmm

Answer 4

15+0.08x=10+0.18x
(0.18-0.08)x = 15-10
x=(15-10)/(0.18-0.08)=50
So at 50 minutes (over 15 days), the two plans cost the same.