SCSS Column mixin with optional margin

Quick and dirty SCSS mixin for equal size columns. Just add "@include column(numberOfRows, MarginSizeInPercent);" to any class with the appropriate values in place of these placeholders. I often find 3% works well as a standard margin size, so if no margin value is passed thorugh the mixin, 3% will be the default.

.col-1
.col-2
.col-2
.col-3
.col-3
.col-3
.col-4
.col-4
.col-4
.col-4
.col-5
.col-5
.col-5
.col-5
.col-5
.col-6
.col-6
.col-6
.col-6
.col-6
.col-6
.col-7
.col-7
.col-7
.col-7
.col-7
.col-7
.col-7
.col-8
.col-8
.col-8
.col-8
.col-8
.col-8
.col-8
.col-8