So, maths to follow here is:
1 turn = 50%
2 turn = 50% (activated turn 1) + 50% x 50% (activated only on turn 2) = 50% + 25% = 75%
3 turn = 50% + 50% x 50% + 50% x 50% x 50% = 50% + 25% + 12.5 = 87.5%
4 turn = 50% + 25% + 12.5% + 6.25 % = 93.75%
5 turn = 96.875%
6 turn = 98. 4375%
7 turn=...