2 + 98 = 100 1 + 99 = 100
4 + 96 = 100 2 + 98 = 100
6 + 94 = 100 3 + 97 = 100
8 + 92 = 100 4 + 96 = 100
10 + 90 = 100 5 + 95 = 100
12 + 88 = 100
14 + 86 = 100
16 + 84 = 100
18 + 82 = 100
20 + 80 = 100
22 + 78 = 100
24 + 76 = 100
26 + 74 = 100
28 + 72 = 100
30 + 70 = 100
32 + 68 = 100
34 + 66 = 100
36 + 64 = 100
38 + 62 = 100
40 + 60 = 100
42 + 58 = 100
44 + 56 = 100
46 + 54 = 100
48 + 52 = 100
2400 + 50 + y = 4900
y = 2450
