Question

A basic cellular package costs $20 per month for 60 minutes of calling, with an additional charge of $0.30 per minute beyond that time. The cost formula would be C = $20 + $0.30(x - 60). If you have to keep your bill lower than $50, what is the maximum calling minutes you can use?

Answer 1

160 minutes

Explanation:

I'm not sure what x is.

I think total time to call is x

So, we have: $20 + $0.30(x - 60) < $50

=> (x-60) < 100

=> x<160