Câu 78: CTFL-V4-0: Certified Tester Foundation Level (CTFL) v4.0

You validate the correctness of price calculation in a food ordering application. The input parameter is the order amount (in $), and the result is the final price reflecting the discount. If the order amount is less than $100, the discount is not granted (0% discount). If the order amount is greater than $500, a 50% discount is granted. In other cases, the 10% discount is granted. You apply equivalence partitioning for the “order amount” domain to check if discounts are granted correctly. Which test data set achieves the highest coverage?

1. A. 100.01, 499.99, 500.01
2. B. 50.99, 500, 500.10 — đáp án hiện tại
3. C. 99.99, 100, 500
4. D. 0, 10, 50