A fruit seller mixes 7 dozen bananas at Rs. 40 per dozen with 4 dozen bananas of another type at Rs. 80 per dozen and sells the mixture at Rs. 68 per dozen. Calculate his profit percent.

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?