A shopkeeper sells an article for Rs. 1120 and earns some profit. The loss incurred when it is sold for Rs. 400 is equal to 17 times the initial profit. If he wants to make a profit of 10%, then at what price should he sell the article? (In Rs.)

A company considers hiring an extra machine for $150 per day to produce additional units. If the additional throughput contribution generated from producing these units on the machine is $390, by how much will total profit increase?

If the cost price of an article is 85 times its selling price, what is the loss percentage?