What will come in place of the question mark (?) : 28% of 450 + 45% of 280 = ?

What will come in place of the question mark (?) : 28% of 450 + 45% of 280 = ?

What will come in place of the question mark (?) : 28% of 450 + 45% of 280 = ?
 (a) 126
 (b) 252
 (c) 324
 (d) 212
 (e) None of these

Ans: ( b )  252