Final answer:
To find the savings from a 20% discount on a $20 shirt, multiply the original price by the discount percentage expressed as a decimal. The calculation shows that the buyer saves $4 on this purchase.
Step-by-step explanation:
The question regards calculating the savings from a discount on an item. The original price of the shirt is $20, and the buyer will be saving 20% due to the sale. To compute the savings, multiply the original price by the discount percentage expressed as a decimal.
Savings = Original Price × Discount Percentage
Savings = $20 × 0.20
Savings = $4
Therefore, the buyer saves $4 on the shirt due to the 20% discount.