To do Alt + h p on Mac in Excel, download and install Accelerator Keys, then press Option, followed by h, p.
Command: Percentage Style
This is how to do Alt + h p on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + h p formats the selected cells as percentages. The number is multiplied by 100 and displayed with a percent sign.