I think that's an unanswerable question. You can't factor in everything you would need to take the shot. From footwear to Binos, rifle sling to buying the primer.
If you look at it from that way, then so far I think all the deer I have shot in the last 2 years (30-40) including what I paid for the syndicate, vehicle all equipment I think each deer has cost about.....
£200
Again depending on who you shoot with and your location, this can vary from free to £500.
A difficult question, but good for thought