Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.4)
// Compass (v1.0.0.alpha.18)
// ----

@mixin fontsize($size:1.6, $line: $size * 1.5){
    font-size:   ($size * 10) + px;
    line-height: ($line * 10) + px;
    font-size:   $size + rem;
    line-height: $line + rem;
}

.foo{ 
  @include fontsize(1.4, 2); 
  }

SassMeister-output.css

.foo {
  font-size: 14px;
  line-height: 20px;
  font-size: 1.4rem;
  line-height: 2rem;
}