A doll is sold for Rs. 220. What was the cost of doll if rate of profit was 10% of the cost?

A) Rs. 198

B) Rs. 200

C) Rs. 210

D) Rs. 240

Let the cost price be x.

Selling Price = Cost Price + Profit% . Cost Price

Here, Selling price = 220

Profit % = 10

220 = x + 10%.x

220 = x + 0.1x

220 = 1.1x

There fore, x = 200

So, Cost Price = Rs. 200

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