I work in a field where we have a number of calculations based on the following:

Fixed price plus a price per Kg, "fixed amount+(quantity * unit price)"

If a quantity is below a value a fixed fee otherwise calculated value "if value less than amount, fee else calculate rate * unit price)

**Examples:**

216 Kg @ 0.20 + Fixed amount 75.00 **=75.00 +(216 * 0.20)**

150 Kg @ 0.10 < 50.00 **=if( 0.10 * 150 < 50.00. 50.00, 0.10 * 150)**

Would it be possible to add calculated inventory formulae to the charges. Otherwise we are doing manual calculations where these facts are concerned. formulae above based on MS Excel