A silo is constructed using a cylinder with a hemisphere on top. The circumference of the hemisphere and the circumference of the cylinder are equal. The diameter of the circular base of the cylinder is 10 feet. The cylinder is 40 feet tall. One of the circular bases on the cylinder is in contact with the ground.
What is the area of the surface of the silo that will be exposed to rain, wind, and sun?
450π square feet
475π square feet
500π square feet
525π square feet