=IIf([BPSPF1Grade]>0,(nz([BPSPF1Grade],0)+nz([BPSPF2Grade],0)+nz([BPSPF3Grade],0)
+nz([BPSPF4Grade],0)+nz([BPSPF5Grade],0)+nz([BPSPF6Grade],0)
+nz([BPSPF7Grade],0)+nz([BPSPF8Grade],0)+nz([BPSPF9Grade],0)
+nz([BPSPF10Grade],0)+nz([BPSPF11Grade],0)+nz([BPSPF12Grade],0)
+nz([BPSPF13Grade],0)+nz([BPSPF14Grade],0)+nz([BPSPF15Grade],0)
+nz([BPSPF16Grade],0)+nz([BPSPF17Grade],0)+nz([BPSPF18Grade],0)
+nz([BPSPF19Grade],0)+nz([BPSPF20Grade],0)+nz([BPSPF21Grade],0)
+nz([BPSPF22Grade],0)+nz([BPSPF23Grade],0)+nz([BPSPF24Grade],0)
+nz([BPSPF25Grade],0)+nz([BPSPF26Grade],0)+nz([BPSPF27Grade],0)
+nz([BPSPF28Grade],0)+nz([BPSPF29Grade],0)+nz([BPSPF30Grade],0))/[PFNum],0)