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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