A school band is having a fundraiser. Band members will sell coupon books for $10 each. The band earns $12.50 for every 5 coupon books that are sold.
a. After the first week, the band members had sold 105 coupon books. How much money did the band members earn from the 105 coupon books? Show your work or explain how you know.
b. The band raised a total of $1062.50. How many coupon books did the band members sell? Show your work or explain how you know.
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