A shopkeeper sells sugar at Rs 30 per kg, which he bought at Rs 24 per kg. He also uses a false weight, giving only y grams of sugar instead of 1000 grams marked on the scale. Through this combination, the shopkeeper earns a total profit of 6623%. Find the value of y.

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?