Final answer:
To calculate the discount price of a $18 T-shirt with a 20% discount, multiply the regular price by 0.20 to find the discount amount ($3.60), and subtract this from the regular price, resulting in a final price of $14.40.
Step-by-step explanation:
The student has asked how much the T-shirt will cost after a 20% discount if its regular price is $18. To calculate the discount price, we first need to determine the amount of the discount by multiplying the regular price of the T-shirt by the discount percentage. Then, we subtract this discount amount from the regular price to find the final price.
Here's a step-by-step calculation:
- Calculate discount amount: 20% of $18 = 0.20 × $18 = $3.60.
- Deduct discount from regular price: $18 - $3.60 = $14.40.
Therefore, the discount price of the T-shirt is $14.40.