[ic] Displaying item prices inclusive of sales tax

[interchange-users@icdevgroup.org (Interchange user)]

Hello,

I want to display prices with and without UK tax. Can anyone tell me the best 
way to do this?

The following doesn't work because [item-price] returns a currency character 
before the price:

[calc][item-price] * __TAX_MULTIPLYER__[/calc]

If I use [item-price noformat=1], I get a 5 d.p. number, and I would have to 
display the currency symbol manually.

Is there some other way around this, or shall I use Perl?

Thank you.