Question

If the percent increase from $5$ to $12$ is equal to the percent increase from $12$ to $x$, then the value of $x$ is

• A. $16.8$
• B. $19.0$
• C. $26.6$
• D. $28.8$

Answer 1

The correct option is D $28.8$

As per the condition:

$\frac{12-5}{5}=\frac{x-12}{12}$

$\Rightarrow \frac{7}{5}=\frac{x-12}{12}$

$\Rightarrow 12\times 7=5x-60$

$\Rightarrow 84=5x–60$

$\Rightarrow 144=5x$

$\Rightarrow x=28.8$