21. Find the discount rate.
sweater
regular price: $\$ 21$
amount of discount: $\$ 3.15$

Answer

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Answer

Final Answer: The discount rate is $\boxed{15\%}$

Steps

Step 1 ：Given that the regular price of the sweater is $21 and the amount of discount is $3.15.

Step 2 ：Calculate the discount rate by dividing the amount of discount by the regular price and then multiplying by 100 to get the percentage.

Step 3 ：$\text{discount rate} = \frac{\text{discount amount}}{\text{regular price}} \times 100$

Step 4 ：Substitute the given values into the formula: $\text{discount rate} = \frac{3.15}{21} \times 100$

Step 5 ：Simplify the expression to get the discount rate.

Step 6 ：Final Answer: The discount rate is $\boxed{15\%}$