How to set transaction cost as a percentage?


Hey there, any one know how to set transaction cost as a percentage in backtest? 

The online platform currently supports fixed cost setup. If your strategy always trades at a fixed lot size, you can convert to the fixed cost assumption using

Per Order Fixed Cost = (my order lot size) x (contract size) x c%

Otherwise, you can use the formula below as a proxy for the total transaction cost.

Total Transaction Cost = (Annual Turnover Rate) x (Initial Capital) x c%

where c% is the transaction rate