AlgebraHardMinutes used from a phone bill
Algebra practice question
A phone plan costs 20 dollars a month, which includes 300 minutes of calls, plus 5 cents for each minute over 300. In a month when the bill was 32.50 dollars, how many minutes of calls were used?
Answer: 550
The extra 12.50 dollars at 0.05 per minute is 250 minutes over the 300 included, so 550 minutes in all.
Common wrong answers
- If you answered 250
- 250 is only the minutes over the allowance.
- If you answered 300
- 300 is the included allowance.
- If you answered 650
- 650 divides 32.50 by 0.05 without removing the 20-dollar charge.
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