Question

The profit percentage earned by selling a watch for Rs. 820 is as much as the loss percentage incurred when it is sold for Rs. 650. What is the cost price of the watch?

Accepted Answer

C. Since the profit percentage equals the loss percentage, the absolute monetary profit equals the absolute monetary loss. $$820 - CP = CP - 650$$ $$2 CP = 820 + 650 = 1470 \implies CP = 	ext{Rs. } 735$$

Profit and Loss Symmetry

Explanation

Practise this under exam conditions