Kaio-ken and Kaio-ken x2 is the same thing. I believe they only mention kaio-ken x2 here -
Kaio-ken power =
A Base =
B
A x
B = C
If the Kaio-ken was 2x and his base was 8000 -
2 x
8000 =
16,000
If the Kaio-ken was 3x and his base was 8000 -
3 x
8000 =
24,000
Random one-
If the Kaio-ken was 5x and his base was 200 -
5 x
200 =
1000
Its simple =)