Final answer:
The discount amount on the goggles is calculated by multiplying the original price of $18 by 20%, resulting in a discount of $3.60.
Step-by-step explanation:
To calculate the discount amount on the goggles that are 20% off, you would multiply the original price by the discount percentage. If the original price is $18, you would calculate the discount by multiplying 18 by 0.20 (20%). So, the discount amount in dollars can be found with the following calculation:
$18 × 0.20 = $3.60
Thus, The discount amount on the goggles is calculated by multiplying the original price of $18 by 20%, resulting in a discount of $3.60.