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

🧠 Explanation:

A doll sold for Rs. 220 with a 10% profit on the cost price means the cost price is Rs. 200. To find this, understand that a 10% profit adds 10% of the cost price to itself, making the selling price 110% of the cost. So, if the cost price is X, then X × 1.1 = 220. Solving this, X = 220 ÷ 1.1 = 200. Knowing the cost price helps in understanding profit calculations, which is useful for business and financial studies.