How is the daily/month compound interest calculated?

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I am trying to work out how this website is calculates the daily and month compound interest. The website is taking the profit/loss from the broker for each trade and calculating the overall % gain. The it calculates the compound.

I am not sure how many days it is using for its calculation. There are 22 trades on the chart.

Here is the link to the website https://www.myfxbook.com/portfolio/forex-pro-island/5359331

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