How can I work out Custom's Charges?

[videonasty]

How can I work out how much Custom's I will pay on, say £30?

 

[PaulaB]

On anything over £18 it will be 21% (3.5 duty 17.5% vat) so it will be

so for £30 it will be

£6.30 + £4 for the post office fee

 

[videonasty]

A third of the DVD price is utterly ridiculous!

Thanks for the help any how.