42% of a number is 892.5. What is 73% of that number ?

Answer: Option C

Let the number be x
Then,
$$\begin{array}{rl}& 42\%\text{of}x=892.50\\ & \Rightarrow \frac{42x}{100}=892.50\\ & \Rightarrow x=\left(\frac{892.5\times 100}{42}\right)\\ & \Rightarrow x=2125\\ & \therefore 73\%\text{of}2125\\ & =\left(\frac{73}{100}\times 2125\right)\\ & =1551.25\end{array}$$