Joelle would like to tip her hairdresser 20 percent If her haircut costs 38 point 0 0 dollars , which expression should she use to find the tip amount?

Convert 20 percent to a decimal by dividing by 100: 20% = 0.2. Multiply the haircut cost, $38, by 0.2 to find the tip, so the correct expression is 0.2 times 38, choice D.

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