A hole in the sphere - Part 2

A sphere of radius $R$ has a cylindrical hole drilled through it. The radius of the hole cylinder is $\frac{R}{2}$ , and its axis is a distance of $\frac{R}{2}$ away from the center of the sphere. This is depicted in the figure below. What percent of the sphere surface area has been drilled out?

Note: It is possible to obtain the exact percentage by finding the exact drilled out surface area.