Please Help with: A- level Accuracy in Electrical investigations!

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CorpusLuteum
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I've sourced this from Physics and Math Tutor : http://pmt.physicsandmathstutor.com/...stigations.pdf

And I just need help with these highlighted equations and why they aren't the same? I'm sort of confused with the whole concept of it -- also quite confused with the face '1.05' was used to find the percentage????

I'd really appreciate if the explanations were spoon fed, because I seriously don't get where things are coming from.
Thank you.Attachment 670606
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CorpusLuteum
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