The answer is 1400
100 + 700 = 800
700 + 60 + 8 = 768
700 + 700 = 1400 DCC + DCC = MCD
1500 + 700 = 2200
50 + 700 = 750
700 + 4 = 704
5 + 700 = 705
7000 + 700 = 7700
200 + 500 = 700
If it isn't a trick question it is 736. 700 plus 30 equals 730 and then plus 6 equals 736.
700 + 80 + n = 780 + n = 700 + 80 + n = 700 + 80 + n = 700 + 80 + n = 700 + 80 + n = 0 = 0
200,010,700