Does it really need to be in the cell underneath the last item?
Surely the days of totals at the bottom of a list went out of fashion after we ditched pencil and paper and went digital.
The best place for totals is in a fixed cell above the data. If it needs to be visible all the time then either set a freeze pane underneath the total, or an often forgotten - (or never known way) is to use the camera tool and take a shot of the total cell then move the camera image to wherever you want.
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