Question

denises cell phone plan is $29.95 per month plus $0.10 per minute for each minute over 300 minutes of call time. denises cell phone bill is $59.95. how many minutes over was she billed?

Explanation:

Step1: Subtract base - fee

First, subtract the base - monthly fee from the total bill. Let $x$ be the number of minutes over 300. The base - fee is $29.95$ and the total bill is $59.95$. So the amount due to extra minutes is $59.95 - 29.95$.
$59.95−29.95 = 30$

Step2: Calculate extra minutes

Since each extra minute costs $0.10$, we can find the number of extra minutes $x$ by dividing the amount due to extra minutes by the cost per extra minute.
$x=\frac{30}{0.10}=300$

Answer:

300