Once you have exported your data as a .CSV via your email you can then import that to excel.
Open the email on the iPad.
Firmly tap the email attachment. If you tap lightly it will display the view of the spreadsheet instead of importing it. Tapping firmly will present an import option.
Select the Excel option to import.
It will open the app you selected and present the document.
The totals are not formulas - they are simply the value at the time of export.