Bao buys a skateboard that originally cost $38. He uses a coupon to save 20% after sales tax. The sales tax rate is 6.25%. How many dollars does Bao pay for the skateboard?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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