Limit Characters for Currency

[eluser]zeedy2k[/eluser]
ok, need slight bit of help here as its baffling me.

I have an amount but need to add VAT to that amount. Now, when I add the VAT (17.5%) to some of the figures it adds triple digit pence eg, £52.875. Is there an easy way to limit the pence to 2 digits?

Cheers
Robert