Solve this : 15% of 578 + 22.5% of 644 = ?

Answer: Option B

15% of 578 + 22.5% of 644
$$=\left(\frac{15}{100}\times 578\right)+$$   $$\left(\frac{225}{10}\times \frac{1}{100}\times 644\right)$$
$$\begin{array}{rl}& =86.7+144.9\\ & =231.6\end{array}$$