By selling 6 tablets for a rupee, a man loses 35%. To gain 30%, how many tablets must he sell for a rupee?

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?