Adding and Subtracting Areas

The designers of the above pool are creating a similar pool for another hotel. If the area of the entire space is $750 m^{2}$ and each of the 4 islands has a radius of $\frac{5}{\sqrt{\pi}} m$, what area of the pool is taken up by water? $\\$ Assume: $\\$ $\bullet$ Each island is the shape of a perfectly circular disk. $\\$ $\bullet$ The area of a circle is $\pi r^{2}$