Question : Find the single equivalent discount of 10% and 20%.
Option 1: 26%
Option 2: 28%
Option 3: 30%
Option 4: 32%
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Correct Answer: 28%
Solution : Single equivalent discount = $(a+b-\frac{a×b}{100}$)%, where $a$% and $b$% are successive discounts. So, the single discount of two successive discounts of 10% and 20% $ = 10 + 20 - \frac{(10 \times 20) }{ 100} $ $=30-2$ $= 28\%$ Hence, the correct answer is 28%.
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