Profit, Loss and Discount

Let CP of one pen be x. CP of 10 pens = 10x. SP of 9 pens = 10x, so SP of one pen = 10x/9. Profit = SP - CP = 10x/9 - x = x/9. Profit percentage = (Profit / CP) * 100 = (x/9 / x) * 100 = 100/9 = 11 1/9%.

The cost price is 80. The marked price is 120. A 40% discount on 120 is 0.4 * 120 = 48. The selling price is 120 - 48 = 72. The loss is 80 - 72 = 8. The loss percentage is (8 / 80) * 100 = 10%.

CP1 = 990 / 1.1 = 900. CP2 = 990 / 0.9 = 1100. Total CP = 900 + 1100 = 2000.

Marked Price * (1 - 0.10) = 248.50. Marked Price = 248.50 / 0.9 = 276.11.

The cost price is Rs. 10 and the gain is 10%. The gain amount is 10% of 10 = 1. The selling price is cost price + gain = 10 + 1 = 11.

Profit is 33% of cost price (CP), so Selling Price (SP) = CP + 0.33*CP = 1.33*CP. Given SP = 120,000, CP = 120,000 / 1.33 = 90,225.56. The closest option is 90,226.

Selling price = Cost price * (1 - loss%). 280 * (1 - 0.10) = 280 * 0.9 = 252.

Cost price = 38,000. Selling price = 30,400. Loss = 38,000 - 30,400 = 7,600. Loss percentage = (7,600 / 38,000) * 100 = 20%.

Loss = 10000 - 9000 = 1000. Loss percentage = (1000 / 10000) * 100 = 10%.

Total cost = 6300 + 200 = 6500. Selling price = 10 * 780 = 7800. Profit = 7800 - 6500 = 1300. Profit percentage = (1300 / 6500) * 100 = 20%.

Total cost = 20 * 200 = 4000. Selling price = 5000. Profit = 5000 - 4000 = 1000. Profit percentage = (1000 / 4000) * 100 = 25%.

The cost price is 75% of Rs 1600, which is Rs 1200. Selling at Rs 1440 gives a profit of Rs 240, while the customer saves Rs 160, equal to 10% of the printed price.

Cost Price = 18000 * 0.8 = 14400. Selling Price = 18000 - 2700 = 15300. Profit = 15300 - 14400 = 900. Rebate percentage = 2700 / 18000 = 15%.

Cost price of 1 orange = 10/11. Selling price of 1 orange = 11/10. Profit = (11/10 - 10/11) / (10/11) = (121-100)/110 * 11/10 = 21/110 * 11/10 = 21/100 = 21%.

Let the marked price be M. A 25% discount means the selling price is 75% of M. So, 0.75 * M = 240. M = 240 / 0.75 = 24000 / 75 = 320.