That's what I did - here's the formulas to save you some time
Cell Q2: =IF(AND(ISNUMBER(O2),ISNUMBER(P2)),((O2-P2)/7.45)+0.4,"")
Cell R2: =IF(AND(ISNUMBER(O2),ISNUMBER(P2)),100*(O2-P2)/O2,"")
If you put those in and then fill down you should be right to go. The Make Recipe button on the Main...