Final answer:
To calculate the discount on the $15.00 sweater, multiply the price by 20%, resulting in a $3.00 discount. The sale price is then $15.00 minus $3.00, equating to $12.00.
Step-by-step explanation:
The student is asking about calculating a discount and the sale price of a sweater priced regularly at $15.00 with a 20% discount. To find the discount amount, you multiply the regular price by the discount rate, which in decimal form is 0.20 for 20%. Applying this calculation: $15.00 × 20% = $15.00 × 0.20 = $3.00. Therefore, the discount amount is $3.00. The sale price is then calculated by subtracting the discount amount from the regular price: $15.00 - $3.00 = $12.00. Thus, the sale price of the sweater after the discount is $12.00.