Remove qoutes from property value in SASS

my existing code:
$v: round(($s / 12) * 100) + "%";

resulting in:
width: "17%"; (with quotes)

how do I remove the quotes??

One thing to remember is that when you put something into “quotes” you are creating a string vs an integer. So are you trying to create an integer or a string? There must some place where you told it you were looking for a string and so therefor you are getting a string returned to you.