Super fine $40-$gauge copper wire has a diameter of only $0\mathrm{.}080mm$ and weighs only $44\mathrm{.}5\frac{g}{k}m.$ Suppose a spool of $40-$gauge wire weighs $652.g$ less after some wire is pulled off to wind a magnet. How could you calculate how much wire was used?

Set the math up$.$ But don't do any of it$.$ Just leave your answer as a math expression.

Also, be sure your answer includes all the correct unit symbols.