Centering nested scaled movieclip (because i'm mathematically illiterate :D)

So i have a movieclip(content_mc) that contains 4 movieclips(img1, img2, img3, img4) of different widths within it. The content_mc has been scaled to the browser using _xscale and _yscale.

so if i want to center img1 on the screen the math WITHOUT content_mc being scaled would look like this

Stage.width/2-(content_mc._width - content_mc.img4._width - content_mc.img3._width - content_mc.img2._width - content_mc.img1._width/2)

but being the fact that it’s scaled…it returns the original _width values of the nested movieclips.

How do i get the values of the new, scaled widths?