Solve this : (23.6% of 1254) - (16.6% of 834) = ?

Answer: Option C

$$\left(23.6\%\text{ of 1254}\right)-\left(16.6\%\text{ of 834}\right)$$
$$=\left(\frac{236}{10}\times \frac{1}{100}\times 1254\right)-$$     $$\left(\frac{166}{10}\times \frac{1}{100}\times 834\right)$$
$$\begin{array}{rl}& =\frac{1}{1000}\left(236\times 1254-166\times 834\right)\\ & =\frac{12}{1000}\left(24662-11537\right)\\ & =\left(\frac{12\times 13125}{1000}\right)\\ & =157.5\end{array}$$