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

Successive discount of 10% and 20% are equivalent to a single discount of :
[A]12%
[B]28%
[C]30%
[D]15%

28%
Successive discount of x% and y% = \left ( x+y-\frac{x\times y}{100} \right )%
∴ Required discount = \left ( 20+10-\frac{20\times 10}{100} \right )%
=>30-2=28%
Hence option [B] is the right answer.

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