Formulae errors pleaes help

Hi

I have a formulae which is defined as below :

Formu = ( Price1 x Weight 1 ) / weight 2

Now because prices has Values in Dollar and Weight has values in Lb and Pound.

In the result it appears as

$6789.0456 Lb

Both $ and Lb appears in Result Output.

Can any one please advise how to resolve this..

How to stop this display with $ and Lb.

If i have to chose the Display of Either values how to do that

If i want to display just $ how to do that ?

If i want to display just Lb how to do that ?

If i want to display Neither $ nor Lb how to do that ?

Pleaes help