Board Thread:Wiki discussions and announcements/@comment-26053782-20150129202217/@comment-24055932-20150217145841

Okay, I deducted the formula for 2 amplification effects. In the formula those two amplification effects are named "A" and "B" and mean "amplification factor - 1". The initial value is named "V". The formula is:

V·(A + 1)·(B + 1)/(1 - A·B)

Let's run an example. We got 500 AP, Rabadons and Dragon Buff. Therefore A = 0.3, B = 0.06 (you may swap the values for A and B) and V = 500. After entering the numbers:

500·(0.3 + 1)·(0.06 + 1)/(1 - 0.3·0.06) = 701.6293279

For creating the formula I used what Chemicalfrore said for how 2 different boni get amped.