You can print certain sections of a spreadsheet by highlighting the target area, going to the print settings, and choosing the 'print selected area' option.
Just select an empty cell directly below a column of data. Then on the Formula tab, click AutoSum > Sum. Excel will automatically sense the range to be summed.
The formula to calculate a percentage in Excel is (part/total)*100. By default, Excel automatically calculates the percentage when you apply the correct.
Select the data you want to check for duplicate information. Then, from the Home tab, select Conditional Formatting > Highlight Cell Rules > Duplicate Values.