45% of 300 + ? = 56% of 750 - 10% of 250

Answer: Option D

Let 45% of 300 + $$\sqrt{x}$$ = 56% of 750 - 10% of 250
Then,
$$\left(\frac{45}{100}\times 300\right)+\sqrt{x}=\left(\frac{56}{100}\times 750\right)$$       $$-\left(\frac{10}{100}\times 250\right)$$
$$\begin{array}{rl}& \Rightarrow 135+\sqrt{x}=420-25\\ & \Rightarrow \sqrt{x}=260\\ & \Rightarrow x={\left(260\right)}^2\\ & \Rightarrow x=67600\end{array}$$