If the profit earned by selling an article for Rs. 1,560 is the same as the loss incurred by selling the same article for Rs. 1,060, then what is the cost price of the article?

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?