Scaling/rounding in .bsh

[Iain Fogg <ia...@westnet.com.au>]

Dumb question time...

How do I scale/round in a .bsh script? I need to mangle some reports to 
handle VAT/GST and I need to work with values significant to 2 decimal 
places. This has got to be obvious, but not to me in my bleary eyed state...

For example, I want calculate an item's GST to 2 decimal places I will 
display the GST on an invoice and sum a series of  these "itemGSTs" to 
calculate a tax subtotal, and naturally, I want the  displayed values 
and the subtotal not to exhibit any discrepancies.

Currently I'm using things like
 
<#assign itemGST=(invoiceItem.quantity?double * 
invoiceItem.amount?double * 0.10)>

to calculate, and

<@ofbizCurrency amount=itemGST isoCode=invoice.currencyUomId?if_exists/>

to display the values. Obviously, the latter is applying some 
scaling/rounding rules, and I want to apply the same rules to my running 
totals to make sure things add up.

Assistance appreciated...

Cheers, Iain


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