Successive discounts of 10 % and 20 % are equivalent to

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Successive discounts of 10 % and 20 % are equivalent to a single discount of :

1. 30%
2. 15%
3. 28%
4. 12%

Correct Option: C

As we know from the formula;

Successive discounts of D₁ % and D₂ % =		D₁ + D₂ −	D₁ × D₂		%
			100

∴ Required discount =		20 + 10 −	20 × 10		%
			100

⇒ Required discount = 30 – 2 = 28%