To give you a quick overview,
$40 = £25 the UK has a 20% tax rule for general goods this means the game should cost £30 as 20% of the original value is £5.
English
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I was sure it had to be because of your high tax rate...when I lived in Italy my income tax was 46%
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Income tax is charged at different rates depending on what you earn, the above is a summary of how the game should work in the UK.