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the value multiplied by the amount in percentage = value*50%
1- Right click on a cell
2- Select - Format Cells - option
3- Choose - Percentage - option
Change the cell format to percentage.
find the link below for the details:
http://www.excelfunctions.net/Percentages-In-Excel.html
Quick tip: user cell format as Percentage
For getting the percentage value, use the percentage formulae.