X can do a piece of work alone in 15 days while Y alone can do it in 10 days. They worked together for 3 days and remaining work is finished by Z in 1 day. If they get paid Rs. 4000 for the entire work, then what is the share of Z?

A

Rs. 2000

B

Rs. 1000

C

Rs. 1200

D

Rs. 800