MCQ Subject: Simplification & Approximation

Simplify: (2^3 * 5^2) / (2^2 * 5^3)

A number is decreased by 25% and then increased by 20%. What is the overall percentage change?

A sum of money amounts to Rs. 1,200 in 3 years and Rs. 1,350 in 5 years at simple interest. What is the rate of interest per annum?

A store first reduces the price of a shirt by 20% and then increases it by 15%. If the final price is ₹420, what was the original price?

Simplify: 12.5% of 640 + (15% of 320 / 4)

A store increases the price of a book by 25% and then decreases it by 20%. What is the net percentage change in the price of the book?