एक वस्तु को 31 रुपये में बेचने पर एक दुकानदार को 7% की हानि होती है। यदि वह वस्तु को 35 रुपये में बेचता है, तो उसका लाभ या हानि प्रतिशत क्या है?

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?