Find the value : 3.2% of 500 × 2.4% of ? = 288

Answer: Option D

Let 3.2% of 500 × 2.4% of x = 288
Then,
$$\Rightarrow \left(\frac{32}{10}\times \frac{1}{100}\times 500\right)\times$$     $$\left(\frac{24}{10}\times \frac{1}{100}\times x\right)$$   $$=288$$
$$\begin{array}{rl}& \Rightarrow 16\times \frac{3x}{125}=288\\ & \Rightarrow x=\frac{288\times 125}{16\times 3}\\ & \Rightarrow x=750\end{array}$$