It would cost Tia $32 before taxes.
Explanation:
Step 1:
Since the store is advertising 20% off listed prices, we would have to calculate 20% of $40
First, let's divide the 20 by 100 which is 0.2
Step 2:
Now multiply the 0.2 with the given price, which is $40
0.2*40 = 8
$8 is the amount Tia would get off on the product
Step 3:
The $8 would be subtracted from the original price of the product, which is $40
40-8 = 32
Thus, Tia could buy the item for $32 before taxes.