Subject: mathqa
Question: a and b enterd into a partnership investing rs . 16000 and rs . 12000 respectively . after 3 months , a withdrew rs . 5000 while b invested rs . 5000 more . after 3 more months . c joins the business with a capital of rs . 21000 . the share of b exceeds that of c , out of a total profit of rs . 26400 after one year by
Option: 
A: none of these
B: rs . 4800
C: rs . 3600
D: rs . 2400
Answer: C