Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $24 monthly fee and charges an additional $0.15 for each minute of calls. The second plan has no monthly fee but charges S0.19 for each minute of calls. For how many minutes of calls
will the costs of the two plans be equal?

600 minutes

Step-by-step explanation:

If we write both situations as an equation, we get:

y1 = 24 + 0.15x

y1 : total cost paid in first plan

x : total minutes of calls

y2 = 0.19x

y2 : total cost in second plan

x: total minutes of call

We are now looking for the situation where the total cost in the two plans is equal, so

y1 = y2

this gives

24 + 0.15x = 0.19x

<=> 0.04x = 24

<=> x = 600