The strength of a school increases and decreases every alternate year by 20%. It started with an increase in 2018. What is the strength of the school at the start of 2021 as compared to that of 2018?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Increase by 15.2%.
Let the school's strength in 2018 = P
Strength at the start of 2021 = P × 1.2 × 0.8 × 1.2 = 1.152P
Percentage change = (1.152 - 1) × 100 = 15.2% increase