Company A charges $25.00 for up to 100 minutes, plus $0.50 for each extra minute. Company B charges $50.00 for an unlimited number for minutes. What are the equations for each company?

Answer 1

Let x = minutes

Company A:
f(x) = 25 , for 0 < x ≤ 100
f(x) = 25 + 0.50(x-100) , for x > 100

Company B:
f(x) = 50 , for any value of x