New Formula based on other Formula

[FluffyKitty]

I currently have a report GROUPED by [Employee_Name] with the following fields: [Total_Orders], [Total_Minutes_per_Order], and [Total_Cost_per_Order] in the GROUP FOOTER. These calculations work great, but when I attempt to calculate the OVERALL [Avg_Cost_per_Order] in the REPORT FOOTER using the following formula: [Total_Cost_per_Order]/[Total_Orders] I do not get the correct value.

Here are my current forumlas:

FIELD:[Total_Minutes_per_Order]
NumberVar TotalSec := datediff("s", minimum({qry_Efficenies.STATUS_DT},{qry_Efficenies.USER_NAME}), maximum({qry_Efficenies.STATUS_DT},{qry_Efficenies.USER_NAME})) ;
NumberVar Hours := Truncate (Remainder ( TotalSec,86400) / 3600)*60;
NumberVar Minutes := Truncate (Remainder ( TotalSec,3600) / 60);
Hours + Minutes

FIELD:[Total_Cost_per_Order]
${@Total_Minutes_per_Order}*1.49

Any input would be helpful. Thank you in advance.