Customers at a phone company are given 2 plans to choose from. The first plan has a one time set up charge of $28 and charges .09 cents per minute.
The second plan does not have a set up charge and costs .13 cents per minute.
After how many minutes of calls will the 2 plans equal the same charge?

Question

Customers at a phone company are given 2 plans to choose from.  The first plan has a one time set up charge of $28 and charges .09 cents per minute.
The second plan does not have a set up charge and costs .13 cents per minute.  
After how many minutes of calls will the 2 plans equal the same charge?

ddcamp · Answer

Cost of plan 1 , A(m) = 28 + 0.9m
Cost of plan 2, B(m) = 0 + 0.13m
For what m does A(m) = B(m)

HINT: Set the two equations equal to each other.