If 12,000 copies of a book are published, where miscellaneous expenditure constitutes 4% of total cost amounting to Rs. 64,800, and the publisher's desired profit margin is 35% over total cost, then what is the marked price of each copy?

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?