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  1. If on a marked price, the difference of selling prices with a discount of 30 % and two successive discounts of 20 % and 10 % is ₹ 72, then the marked price (in ₹) is
    1. ₹ 3600
    2. ₹ 3000
    3. ₹ 2500
    4. ₹ 2400
Correct Option: A

Let the marked price = ₹ N
The discount equivalent to successive discounts 20 % and 10 % = { r1 + r2 - (r1 r2)/100 } %
Where, r1 = 20 and r2 = 10
Then, 30 - 2 = 28 %
According to the question,
{(100 - 28)N}/100 - {(100 - 30)N}/100 = 72
⇒ (72N - 70N)/100 = 72
∴ N = (72 x 100)/2 = ₹ 3600


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