Marked Price of an article is Rs. 1500. A customer pays Rs. 1173 for it. If the customer got two successive discounts and the rate of the first discount is 15%, then the rate of the second discount was?

Calculate the first discounted price, then find what second discount rate produces the final price. After 15% discount on Rs 1500, the price becomes Rs 1275. The customer pays Rs 1173, so the second discount reduces Rs 1275 to Rs 1173. The discount amount is Rs 102, which is 102/1275 = 0.08 or 8% of the intermediate price.