Calculate Trading Lot Size Based on Free Margin and Risk Tolerance

This line of code calculates the lot size that can be traded based on the account's free margin and the maximum risk the trader is willing to take.

The calculation is done by multiplying the account's free margin by the maximum risk and then dividing it by the margin required for one lot of the currency pair being traded. The result is then rounded to two decimal places using the NormalizeDouble function.

For example, if the account's free margin is $10,000 and the trader is willing to risk 2% of their account on each trade (MaximumRisk = 0.02), and the margin required for one lot of currency pair being traded is $1000, then the lot size that can be traded would be:

lot = NormalizeDouble(10000 * 0.02 / 1000, 2) = 0.2 lot

This means that the trader can trade a maximum of 0.2 lots of the currency pair being traded based on their account's free margin and risk tolerance.