Provide assistance to Jimmy in checking which field in WHSPID table are the following columns are derived :

Column Name          Fieldname / Formula
COUNT DIFF         - WHPACT - WHPFACT
EXT. PERP. COST - WHPFCT * WHFCST 
EXT. PHYS COST  - WHPACT * WHFCST
EXT COST            - WHPACT * WHFCST
EXT.RETAIL          - WHPACT * WHFRET



