A truck driver has to spend $2 per gallon of gas. She can drive 10 miles per gallon. She drives at a rate of 30 miles per hour. If she is paid $.50 per mile, how much money does she make if she drives for 10 hours? Think carefully first, then make a decision:
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The truck driver drives for 10 hours at 30 miles per hour, so she drives 10 * 30 = 300 miles. Therefore, she needs 300 / 10 = 30 gallons of gas. This will cost her 30 * $2 = $60. She will make 300 * $.50 = $150. Thus, after paying for gas, she will make $150 - $60 = $90. So, the answer is 90.
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