troubleshooting Question

# Crystal Report Group Footer Equation

Crystal Reports
I am trying to get an equation based off the following equations:

Quantity Scrap: Sum ({LaborDistribution.QuantityScrapped},{LaborDistribution.WONumber} )
Cost Analysis Ratio: ({WOHeader.QuantityReleased}/(({@Actual Time Seconds}/60*41.58)/60))
Material Cost: {PartMaster.MaterialCost}
Total Time of scrap: Shared NumberVar scrapped_time;
whileprintingrecords;

numberVar dur := if {LaborDistribution.StartDate} <= Maximum ({@scrapped_time}) then
scrapped_time := scrapped_time + DateDiff ("n", {LaborDistribution.StartDate}, {LaborDistribution.StopDate});
numberVar hrs;
numberVar min;
numberVar sec;
stringVar hhmmss;

hrs := Truncate(Truncate(dur/60)/60);
min := Remainder(Truncate(dur/60),60);
sec := Remainder(dur,60);

hhmmss := totext(hrs,"0") + ":" + totext(min,"00") + ":"+ totext(sec,"00");

When I try and make this equation: Cost Analysis ratio + (Material Cost / Quatity Scrap) + Total Group Time Scrap

When I try this equation out it give me nothing but a blank screen ???
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