How to calculate simple portfolio returns on a monthly basis?


I have a portfolio of 10 of my favourite stocks: Apple, Bank of America, Boeng, Coca Cola, Disney, Exxon Mobile, IBM, J & J, Nike and Walmart. Equally weighted.

I have download data for the time span “1981-01” until “2019-12”.

I would love to calculate the simple portfolio returns
on a monthly basis. And then I am curious how to determine the standard deviation of its return over the entire sample period.

Do anyone have some suggestions how I should start?

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