Help with Estimating Total Area

[higha level]

I have a flat plat that is x by y. It has an unknown number of holes in it but I do know the diameter of the holes is D.

I also know that s/D = 4 where s is the spacing between holes of diameter D. Using this how can I estimate the total area absent in the flat plat, i.e. the amount missing.

Thanks.

 

[Char. Limit]

This sounds like homework and should be placed accordingly. I apologize.