A dishonest shopkeeper professes to sell his goods at cost price, but uses false weights and makes a profit of 1427%. For a weight of 1 kg, what weight does he actually use?

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?