A book seller bought a book for Rs. 40 and sold it for Rs. 45. Find his gain percentage.

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?

A shopkeeper purchased 12 dozen eggs at ₹5 per egg. During transit, 12 eggs were broken. He sold the remaining eggs at ₹6 per egg. Find his profit percentage.

A dealer sold two machines at ₹8,400 each. On one, he gained 20%, and on the other, he incurred a loss of 30%. What is his overall loss percentage in the entire transaction?

A shopkeeper bought 12 dozen eggs at the rate of ₹5 per egg. During transit, 12 eggs were broken. He sold the remaining eggs at ₹6 per egg. Find his profit percentage.

By selling 100 pencils for ₹120, a retailer incurs a loss of 40 percent. How many pencils should he sell for ₹180 to make a profit of 20 percent?

Amit bought 80 pencils (all at the same cost price). He sold 20 pencils at a profit of 30 percent, 30 pencils at a profit of 20 percent, and the remaining at the cost price. If he had sold all pencils at a profit of 20 percent, he would have earned ₹125 more. What is the cost price of each pencil?

80 percent of total articles are sold at a loss of 20 percent and the remaining articles are sold at a profit of 10 percent. What is the overall loss percentage?