Calculator accuracy decimal

Hi, can anybody give me some guideline on how many accuracy decimals to use in calculation, especiallly in virance calculation questions like to calculate contribution to porfolio risk.

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I will set DEC = 9 in my BA II Plus then use STO to store all the numbers then RCL to recall it for the necessary operations. Saves the time in writing.

But if you go manual (write on paper), I would say 6 decimal places. Like 0.123456 for 12.3456%