Answer:
$31.5
Explanation:
The t-shirt is worth $42
$42 is 100% of the actual price or the real price of the t-shirt
25% off, means you subtract 25% of 42 off of the t-shirt, or you find 100% - 25% of the t-shirt
25% - 100% = 75%
75% of 42 = 0.75 * 42 = 31.5
The sale price of the t-shirt is $31.5
-Chetan K