Question

What is the percentage decrease, if a number reduces from $70$ to $42$?

• A. $10\%$
• B. $25\%$
• C. $35\%$
• D. $40\%$

Answer 1

The correct option is D $40\%$

$\Rightarrow$ A number reduces from $70$ to $42$.

$\Rightarrow$ Decrease in number = $70-42=28$

$\Rightarrow$ Decrease % = $[\frac{Decreaseinnumber}{Originalnumber}\times 100]\%$

$\Rightarrow$ Decrease % = $[\frac{28}{70}\times 100]\%=\frac{2800}{70}=40\%$