A software developer is designing a new user interface for a mobile game that requires precise tapping on moving targets. The targets move at a speed of $20$ pixels per second and the user must tap the center of the target to score points. The optimal width of the targets $($W$)$ should be $100$ pixels. The distance from the center of the screen to the nearest moving target $($D$)$ is measured to be $200$ pixels. According to Fitts' Law, what is the expected movement time $($MT$)$ for the user to move their finger from the center of the screen to the nearest target? Explain the meaning of the finding.