First, calculate the Total Buy-in as follows:
Buy-in + Fee + Bounty (if applicable) = Total Buy-in
Then input the Total Buy-in into the following formula as follows:
(Total Buy-in / 100) * Markup * Share % = Total Purchase Amount of Stake
For example:
Total Buy-in = $23.75 Buy-in + $1.25 Fee = $25
Markup = 1.4
Action bought is 10% out of 45% of a particular player's shares.
Then the calculation will be as follows:
Total Purchase Amount of Stake = (25 / 100) * 1.4 * 10 = $3.50