Calculated fields issue

Hi,

I want to use a calculated field to concatenate three fields to give a price with a currency and UOM.  E.g.

Field 1:  Decimal Price

Field 2:  Lookup on Currency entity

Field 3:  Picklist of UOM  kg;lb

The end result would be, for example, "10.2 USD/kg"

The test was not very successful.

Issue #1.  I can concatenate Field 1 and Field 2, but the decimal field is shown at 10 decimal places instead of the two that is configured in the field precision.  Result ==> 10.2000000000 USD.  

Issue #2.  It doesn't seem to be supported to use the Option Set field in the Concatenate calculation so not possible to add the kg/lb UOM.

Any good ideas on how to achieve what I want?