Numerical reasoning question help

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I have got an interview for a trainee accountant role and it requires me to take an aptitude test, so I am doing practice tests online. However I came across this question and I don't understand the answer even with the explanation given. I thought that the percentage decrease for every period would be 5% which was of course incorrect. Can anyone give me an explanation of why it is the answer given please?

This is the link to the test that I am doing and it's question 1:
https://www.wikijob.co.uk/aptitude-test/numerical-practice-1

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  • CeeJaySix
    CeeJaySix Registered Posts: 645
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    The questions must change order - the question 1 I get has no percentages!
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