How do i calculate the percentage error in a liquid measuring experiment?

I need help with this question: Calculate the percentage error likely to arise in an experiment if 1-mL, 5-mL, and 10-mL pipets are used to transfer and each pipet contains 5 drops of water adhering to the inside of the barrel, A single drop of water has a volume of approximately 0.05 mL. I need someone to... show more I need help with this question:
Calculate the percentage error likely to arise in an experiment if 1-mL, 5-mL, and 10-mL pipets are used to transfer and each pipet contains 5 drops of water adhering to the inside of the barrel, A single drop of water has a volume of approximately 0.05 mL.

I need someone to explain HOW to do this and not only the answers. thanks!
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