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1. The selling price of an article after giving two successive discounts of 10% and 5% on the marked price is Rs. 171. What is the marked price?

Solution:
Equivalent Discount,
=(A + B) - AB100
= (10 + 5) - 10×5100
= 14.5%
Let MP = X
Now,
X - 14.5% of X = 171(Selling Price)
0.855X = 171
X = 200
Hence, MP = Rs. 200

Going through options,
200(MP) == 10%(disc.) ⇒ 180 == 5%(disc.) ⇒ 171(CP)

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