Question 31

A man allows a discount of 10% on a book whose marked price is Rs.40. What is the cost price so that the profit is 20% ?

Solution

Marked price = Rs. 40

Discount % = 10%

=> Selling price = $$40-(\frac{10}{100}\times40)$$

= $$40-4=Rs.$$ $$36$$

Profit % = 20%

=> Cost price = $$\frac{36}{(100+20)}\times100$$

= $$\frac{36}{6}\times5=Rs.$$ $$30$$

=> Ans - (C)

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