Answer:Discount (D) = Original Price (OP) × Rate of Discount (ROD)Here’s what each term means:- Original Price (OP): The initial price before any discounts are applied.- Rate of Discount (ROD): The percentage of the discount, expressed as a decimal (e.g., 20% would be 0.20).For example, if the original price of an item is $100 and the rate of discount is 15% (or 0.15), the discount amount would be calculated as follows:D = 100 × 0.15 = $15So, the discount is $15.