1. Let's start by understanding what percentage means. A percentage is a way to express a number as a fraction of 100. For example, 50% means 50 out of 100. 2. The formula to calculate percentage is: $$\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100$$ 3. Important rules: - The part is the portion or amount you are interested in. - The whole is the total or complete amount. 4. Now, here are some multiple-choice questions (MCQs) on percentage: Q1: What is 25% of 200? A) 25 B) 50 C) 75 D) 100 Q2: If 30 is 60% of a number, what is the number? A) 18 B) 45 C) 50 D) 60 Q3: Increase 150 by 20%. What is the new value? A) 170 B) 180 C) 190 D) 200 Q4: Decrease 80 by 15%. What is the new value? A) 68 B) 70 C) 72 D) 75 5. To solve these, apply the percentage formula and basic arithmetic operations.