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Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged \$120 for 3 days and 300 miles, while Mary was charged \$210 for 5 days and 600 miles. What does Best Rental charge per day and per mile?

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if the daily fee is d, and the mileage fee is m,

3d+300m = 120
5d+600m = 210

\$30/day + \$.10/mile

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