Solve this : 30% of 1225 - 64% of 555 = ?

Answer: Option B

Given,
30% of 1225 - 64% of 555 = (?)
$$\begin{array}{rl}& =\left(\frac{30}{100}\times 1225\right)-\left(\frac{64}{100}\times 555\right)\\ & =\left(367.5-355.2\right)\\ & =12.3\end{array}$$