A ration shop dealer sells his sugar using weights that are 10% less than the true weight, and he also marks up the price to make a profit of 15% on the cost of the weight sold. Find his total overall gain percentage (correct to one decimal place).

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?