A television set has a marked price of ₹20,000. It is sold after two successive discounts. If the first discount is 15% and the final selling price is ₹15,300, find the rate of the second discount.

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?