71. A person sells an article for a loss of 18 percent. If he increases the selling price by Rs. 144 and decreases the cost price by 30 percent, then there is profit of 20 percent. What is the original selling price?
72. Remi earns a profit of 20% on selling an article at a certain price. If she sells the article for Rs. 8 more, she will gain 30%. What is the original cost price of 16 such articles?
73. A Microwave oven is sold in Hyderabad for Rs. M. A retailer, Elahi from Hyderabad went to Madras and bought it for 25% less (when compared to the price in Hyderabad). He spends Rs. 1.000 on transport to bring it from Madras to Hyderabad. He sold it in Hyderabad for Rs. M making a profit of 10%. Find the value of M (in Rs.).
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