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# .cake margin using .icing as context

.icing width = 100% / 800 px

.cake margin = 10px

I would think the formula would be 10 / 800 = .01, making the margin 1%.

Where am I going wrong?

So the width of .icing is 800(px) and the margin on .cake is 10(px). Using target/context we can get the answer

```10/800 * 100 = 1.25%
```

Oh, my calculator was rounded to 2 decimal places, so I didn't realize it was 1.25 instead of just 1. Thanks!

I just checked it out... what you have to do is use the formula... Target/Context. Your target is .icing In there it states in the comment that it's 800px Your context is .cake In there it states in the comment that it's 640px

So 800/640 = 1.25% That is your margin in percentages.

I hope that makes sense. :)

Your answer is correct but the sum is not. The target is the margin of 10px;

Oh man.. you are right. That should be fixed though, so that it doesn't happen to anyone else. Fail on my part. You meant equation not sum right? haha.

Yeah this is a comedy of errors now lol. I can delete your answer if you like and you can re-post?