Medium
Two successive discounts of 20% and 10% are equivalent to a single discount of:
Explanation
Explanation
Step 1: Assume the marked price = ₹100.
Step 2: After the first discount of 20%: 100 − 20 = ₹80.
Step 3: After the second discount of 10% on ₹80: 80 − 8 = ₹72.
Step 4: Total discount = 100 − 72 = ₹28, which is 28% of ₹100.
Step 5: Shortcut: a + b − (ab/100) = 20 + 10 − (20 × 10)/100 = 30 − 2 = 28%.
Answer: 28%.
PRO TIP
Re-check your working by substituting the answer back into the original question.