Directions: Study the following information carefully to answer the questions that follow:

Four shopkeepers Rohan, Mohan, Sohan, Rahul bought LED from the same supplier at the same rate. However, on one day, Sohan got a discount of 10% and got it at Rs.18,000. Rohan sold LED at the profit of 10%, Mohan marked price at 30% more than C.P. and gave discount of 20%, Sohan sold LED at the profit of 15% and Rahul marked price 40% more than cost price and gave two successive discounts of 10% each.