Subject: mathqa
Question: raman mixed 24 kg of butter at rs . 150 per kg with 36 kg butter at the rate of rs . 125 per kg . at what price per kg should he sell the mixture to make a profit of 40 % in the transaction ?
Option: 
A: rs . 189
B: rs . 198
C: rs . 135
D: rs . 162
Answer: A