What is the ruling on calculating the principal before investing $1428 in a currency trading project through a broker, which later led to the transfer of $1350 to an e-gold account after losing some of the profits and the project’s cessation, and then investing the amount in prohibited "surfing" companies, and is it permissible to pay a commission of $100 from the unlawful money to recover the original $1428, or should the principal be calculated as $1350 after deducting transfer fees?

It is obligatory for a Muslim to seek out what is permissible in their dealings, and they must consult people of knowledge before undertaking any activity whose ruling they do not know. Whoever engages in a prohibited transaction must repent and dispose of the unlawful money by spending it on general Muslim welfare projects (such as orphanages, facilities for the sick, and the poor). It is not permissible for him to benefit from it himself, unless he is poor and in need, in which case he may take what he needs from it. As for the questioner's inquiry about permissible investment methods, the website is not specialized in providing advice on this matter. The means of lawful sustenance are many, and one must ascertain their permissibility.