A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?
total work =24 days
A= 6 days=4 unit /day
B= 8 days=3 unit /day
C=? =1 unit / day
A&B&C=3 days=total 8 unit / day
A=4/8*3200=1600
B=3/8*3200=1200
C=1/8*3200=400