Correct Answer - Option 1 : Rs. 480
Given
Selling price of an watch with 15% loss = Rs. 340
Formula
Profit = Selling price – Cost price
Calculation
Selling price = 100% - 15% = 85%
⇒ 85% = 340
⇒ 120% = X ....... (Profit 20%)
⇒ X = [(120 × 340)/85] = Rs. 480
∴ To get profit of 20% a Prakash need to cell watch to Rs. 480