Excel: Rounding, calculating percentages, excel 200

calculating percentages, excel 200, rounding numbers: the 31.3% is really 31.25%, but if you only show 1 decimal position, it shows as 31.3. Same with the 6.3% - really 6.25%. so these 2 actually add up to 37.5, but the display seems to indicate 37.6. The

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