According to a newspaper report, A 63 year old man has rowed around the world without leaving his living room. He clocked up 24084 miles on a rowing machine that he recieved for his 50th birthday. Roughly how many miles per year has he rowed since he was given the machine?

A) 200
B) 500
C) 1000
D) 2000
E) 4000

(can i get it with the full working out please)​