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Math·Geometry and Trigonometry·Area and volume

hard

The figure shown consists of a rectangle and a semicircle, where the length of $\overline{WX}$ is 20 units and the length of $\overline{WZ}$ is 5 units. The diameter of the semicircle is $\overline{WX}$. What is the area of the figure?

A

$100+50\pi$

B

$100+10\pi$

C

$100+100\pi$

D

$20+5+10\pi$