formula

 I am fairly new to accounting and this month a customer has paid me a random lump sum of £8000 with no pay advice.  obviously this £8000  is the figure minus cis deduction which they charged at 20% of 20%  does anyone have a formula for working this out? thanks

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Group: Construction industry accountants
The place to discuss accounting and tax issues specific to the construction industry, including CIS tax, VAT self billing and authenticated receipts.