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

A. 231.4

B. 231.6

C. 231.8

D. 233.6

E. None of these

Answer: Option B

Solution(By Examveda Team)

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