AlgebraEasyMonthly cost of a phone plan
Algebra practice question
A phone plan costs $25 a month plus $0.10 for each text message sent. What is the cost, in dollars, for a month in which 50 text messages are sent?
Answer: 30
Cost = 25 + 0.10 × 50 = 25 + 5 = 30.
Common wrong answers
- If you answered 5
- 5 is the text charges alone, without the $25.
- If you answered 75
- 75 is 25 + 50, charging a dollar per text instead of 10 cents.
- If you answered 30.5
- 30.5 adds an extra 50 cents; 0.10 × 50 is exactly 5.
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