17 articles were bought for ₹3910 and sold for ₹4590. How much was the approximate profit percentage per article?

30 dozen walnuts were purchased for Rs. 14400 and 32 packets of walnuts (20 walnuts in each packet) were purchased for Rs. 57600. If a packet of Akharato was sold for five rupees in a pack at Rs. 432, what would be the profit percentage?

There is 10 % loss if a watch is sold for Rs 1440/-. At What price it is to be sold to get 15 % profit. 

Oranges are bought at 7 for Rs. 3. At what rate per hundred must they be sold to gain 33 % ? 

By a selling basket for Rs. 19.50, a shopkeeper gains 30 %. For how much should he sell it to gain 40 %? 

Cost of 18 shirts and 45 trousers is Rs 68,400. What is the cost of 10 shirts and 25 trousers?

A shopkeeper marked an article 75% above the cost price and sold it after a discount of 50%. Find the cost price of the article if he had a loss of Rs. 156.