“A book’s discount price is 20% less than retail. James buys it at 30% off the discount price. What percentage of the retail price did he pay?”

"A book’s discount price is 80% of the retail price (100% − 20%). James buys it at 70% of the discount price (80% × 70% = 56% of retail). This percentage calculation showcases compound discounts. Understanding the 56% value highlights practical applications of percentage calculations in commerce a key topic in financial mathematics."