Question 357006
let x be the number of calls made in a month.
PLAN A billing = 0.10x
PLAN B billing =12 +0.08x

12+0.08x<0.10x
12<0.10x-0.08x
(12<0.02x)
((12/0.02)<x)
...
((600<x))
...
(for (x> 600) plan B is better)
m.ananth@hotmail.ca