The marked price of a book is ₹ 1,900. A man bought the same for ₹ 1,624.5 after getting two successive discounts, the first being 5%. What was the second discount rate?

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?