We already know that the box has an area of 100 sq. inches. All we have to do now is subtract the area of the 4 circles from the area of the box.
The formula for a circle's area is [tex]A=2\pi r[/tex]. We already know the radius, so one circle has an area of 12.56 units (4π in terms of pi). There are 4 circles, making your final equation [tex]100 - 4(12.56)[/tex].
[tex]100 - 50.24 = 49.76in^2[/tex]
