A person's salary was decreased by 50% and subsequently increased by 50%. By what much percent does his salary increase or decrease?

Decrease 18% Increase 15% Increase 20% Decrease 25%

Decrease 25%

Let salary of Men = 100x New Salary = 100x × \(\frac{150}{100}\) × \(\frac{50}{100}\) = 100x × \(\frac{3}{2}\) × \(\frac{1}{2}\) = 75x Difference = 100x - 75x = 25x Require percentage = \(\frac{25x}{100x}\) × 100 = 25%