A shopkeeper sells sugar at Rs. 40 per kg, which he purchased at Rs. 36 per kg. His weighing machine is faulty and it weighs only 800 gm while selling 1 kg. His percentage profit (correct to 2 decimal places) is:

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?