Question :
The following diagram shows the rainfall over two years. Which of the following months shows the highest percentage change in rainfall?
Option 1: January
Option 2: September
Option 3: May
Option 4: March
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Correct Answer: March
Solution :
$\frac{\text{Rainfall in 2022}}{\text{Rainfall in 2021}}$ in January = $\frac{55}{35} = 1.57$
$\frac{\text{Rainfall in 2022}}{\text{Rainfall in 2021}}$ in March = $\frac{45}{25} = 1.80$
$\frac{\text{Rainfall in 2022}}{\text{Rainfall in 2021}}$ in May = $\frac{75}{45} = 1.67$
$\frac{\text{Rainfall in 2022}}{\text{Rainfall in 2021}}$ in September = $\frac{25}{15} = 1.67$
Since the ratio in March is the highest,
So, March has the highest percentage change.
Hence, the correct answer is March.
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