In another column put in a formula (using the =) to multiply the current cell by 1.15. For example if your current values are in column A, then in the first cell in, say, column B put in the formula =A1*1.15, then copy this down the spreadsheet using the + in the bottom right hand corner of the cell border.
If you particularly want the final values back in the original column then highlight the new column (arrow at the top of the column), copy, highlight old column and select paste special - value.
Go to page setup and under scaling you can adjust to your required percentage
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