Level
pending

Let A be a circle with diameter 20. Let B be a smaller circle that is inscribed on the inside of a quarter-circle of A. If C is the diameter of B, and it can be expressed as \(x.y\) (read "\(x\) point \(y\)"), then what is \(xy\)?

**Details and Assumptions**

- Do not round, simply take the units and tenths digit of the number.

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