alleryA bookstore advertises '20% off, plus an extra 10% off on already-discounted items'. The effective single discount is:
A$30\%$
B$25\%$
C$26\%$
D$28\%$
Answer & Solution
Correct answer: D. $28\%$
Successive discounts: net factor = 0.80 × 0.90 = 0.72. Effective discount = 1 − 0.72 = 28%.
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