Question : A single discount equivalent to the series of discounts 20%, 10%, and 5% is equal to:
Option 1: 32%
Option 2: 30%
Option 3: 30.7%
Option 4: 31.6%
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Correct Answer: 31.6%
Solution : We know, Equivalent discount = $(a+b–\frac{a×b}{100}$)%, where $a,b$ are successive discount. So, $20+10-\frac{20\times 10}{100}=28$% Now again $a = 28$% and $b = 5$% So, $28+5-\frac{28\times 5}{100}=31.6$% Hence, the correct answer is 31.6%.
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