Why dy/dx is 0?

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A political party orders an arch for the entrance to the ground in which the annual convention is being held. The profile of the arch follows the equation $y=2x-0.1x^{2}$ where $y$ is the height of the arch in meters. The maximum possible height of the arch is

- $8$ meters
- $10$ meters
- $12$ meters
- $14$ meters

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