You need to choose between two telephone plans for local calls. Plan A charges $25 per month for unlimited calls. Plan B has a monthly fee of $13 with a charge of $0.06 per local call. How many local telephone calls in a month make Plan A the better deal?

show work please

Question

You need to choose between two telephone plans for local calls. Plan A charges $25 per month for unlimited calls. Plan B has a monthly fee of $13 with a charge of $0.06 per local call. How many local telephone calls in a month make Plan A the better deal?

show work please

anonymous · Answer

Plan A: $25

Plan B: 13 + 0.06t

But A < B (plan A is cheaper than plan B)

25 < 13 + 0.06t

Subtract 13 from both sides

12 < 0.06t

divide both sides by 0.06

200 < t

So when there are greater than 200 calls 
Plan A is better