If you ever get stuck, just remember the golden rule: Part divided by Whole, times 100. Say it out loud three times. Whisper it to your plants. It works.
Now go convert something. Check your grocery bill. Figure out how much of your day you’ve spent on your phone. I won’t tell. And if you mess up? Who cares. Try again. Percentages are like dance moves—clumsy at first, then you own the floor.