Calculating percentage gain on portfolio when buying more?

This is more of a maths problem and it is a pretty begginer one that I’m not too sure with.

But how do you calculate your profit overall if it’s stocks that you keep buying?

So say purchase 1 on Year 1 was 10 stocks @ $50.

And year 2 it’s $100. So that’s 100% gain. But what if you say buy 15 here at $100.

And at year 3 it’s $150. How do you calculate the overall profit of everything?

Is it just the total you have now – the buy amount of the previous two purchases?

 

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