Overall performance of portfolio

I would like to see overall portfolio performance. Right now, if I invest 100 into stock A and 100 into stock B. Then stock A declines to 90 and stock B grows to 150. Then I sell stock B and realize 50 gain. So my overall performance is +40 (+20%), because: 90+150 over 200 invested. Currently I would only see -10 (-10%) performance and 150 in the bank.
Thank you

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