Question

solve the problem. a cellular phone plan had the following schedule of charges: basic service, including 100 minutes of calls $20.00 per month 2nd 100 minutes of calls $0.075 per minute additional minutes of calls $0.10 per minute what is the charge for 200 minutes of calls in one month? what is the charge for 250 minutes of calls in one month? construct a function that relates the monthly charge c for x minutes of calls.

Explanation:

Answer:

For 200 minutes: $27.50
For 250 minutes: $32.50
Function:
\[
C(x) =

$$\begin{cases} 20 & \text{if } 0 \leq x \leq 100, \\ 20 + 0.075(x - 100) & \text{if } 100 < x \leq 200, \\ 27.5 + 0.10(x - 200) & \text{if } x > 200 \end{cases}$$

\]