Final answer:
To find the percent of the sale discount, divide the discount amount by the original price and multiply by 100%. In this case, the discount is 15%.
Step-by-step explanation:
To find the percent of the sale discount, you can use the formula: (Discount amount / Original price) × 100%. In this case, the discount amount is $32 - $27.20 = $4.80, and the original price is $32. Substituting these values into the formula, we get (4.80 / 32) × 100% = 0.15 × 100% = 15%. Therefore, the percent of the sale discount is 15%.