Find the number : 125% of 3060 - 85% of (?) = 408

Answer: Option D

Let 125% of 3060 - 85% of x = 408
Then,
$$\begin{array}{rl}& 85\%\text{ of }x=\left(\frac{125}{100}\times 3060\right)-408\\ & \Rightarrow \frac{85}{100}x=3825-408\\ & \Rightarrow \frac{17x}{20}=3417\\ & \Rightarrow x=\left(\frac{3417\times 20}{17}\right)\\ & \Rightarrow x=4020\end{array}$$