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First you calculate how much is 15% of 1. That is `1 cdot 15/100 = 1 cdot 0.15 = 0.15`.
Now the question is what percent of 15 does that (`0.15`) make? You can calculate that by dividing `0.15` by `15`. So you have ` 0.15/15 = 0.01` which is `0.01cdot100=1%.`
More generally `x%` of `a` is `x/100cdot a` and if you have `a` and `b` then `a/b cdot 100` tells you what percent of `b` is `a.`
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