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I'm awful at maths and this question is in a Biology past paper, but I just don't understand how to get the answer :/
It doesn't explain in the mark scheme either. I'd really appreciate it if someone could help me out! I'm stuck on the answer for the percentage

It's question 3 d (i)

http://www.ocr.org.uk/Images/144756-...and-energy.pdf

Thank you!
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