If cost price = 1500 and selling price = 1200, discount percentage is:

This question involves calculating the discount percentage. Discount is the reduction in price, and discount percentage is the discount amount expressed as a percentage of the original price (cost price in this context, assuming the discount is applied to the initial cost to arrive at the selling price, or more commonly, the discount is calculated on the marked price, which here seems to be the cost price if it's a loss scenario).

• First, calculate the discount amount: Discount = Cost Price - Selling Price = 1500 - 1200 = 300.
• Next, calculate the discount percentage: Discount Percentage = (Discount Amount / Cost Price) x 100%.
• Correct Option C: 20% is accurate because (300 / 1500) x 100% = (1/5) x 100% = 20%.
• Option A: 10%, Option B: 18%, and Option D: 25% are incorrect calculations based on the given values.