The original sales price is $9.
A discount reduces the price an item is sold. After the 75% discount, the sales price is 25% ( 100 - 75%) of the original price.
The equation that can be used to represent the sales price of the item is:
$2.25 = 25% x p
Where p = original sales price.
Original price = $2.25 / 25%
= $2.25 / 0.25 = $9.
To learn more about how to calculate discounts, please check: https://brainly.com/question/9350849