please could you tell me, what the total is - £1,840.00 + 20% =

20% of what? The same money?

Just multiply 1840 by 1.2

Or calculate 0.2*1840 then add the result to 1840.

20% means 20/100 which is 0.2

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Oh maybe I just took the question from the wrong way! Good answer Alan! :)