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Question

The cellular phone plan you signed up for gives you 400 minutes a month for $35 and charges $ .15 for each additional minute over 400 minutes. How long can you talk on the phone each month and stay within a budget of $45?

Answer 1

400 minutes cost $35.

You have $10 left.

At $.15 per minute, how long would it take to use $10?

$10 / $.15/minute = 66.67 minutes.

So 66 minutes will keep you under $10.

If you talk for 67 minutes it will cost 67 X $.15 = $10.05

The total will be 400 + 66 = 466 minutes

(If you talk for 67 minutes over the 400, it would cost $45.05.)