Pens are bought at the rate of 8 for Rs.40 and sold at 6 for Rs.40. Find the loss or gain per cent.
The cost of 8 pens for = Rs. 40 Cost of 1 pen for = 40/8 = Rs. 5 SP of 6 pens for = Rs. 40 SP of 1 pen for = 40/6 = Rs. 20/3 Ratio of CP to SP = 5: 20/3 = 3:4 Let CP = 3 unit and SP = 4 unit Profit =4-3=1 Profit percentage = (1/3) × 100 = 33.33%
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