Let a window on a computer screen have screen coordinates $($min$1,$ min$2)=(140,320)$ and

$($max$1,$ max$2)=(620,840).$ The window is filled with $20$ icons, arranged in a $4$ x $5$ pattern

$($see the figure$).$

a$.$ What screen coordinates would be returned from a mouse click if the messages icon

was clicked? $($To calculate the approximate screen coordinate, take the average of the

lower$/$upper coordinates for that particular position$).$

b$.$ What icon was clicked if the screen coordinates clicked is $(220,780)?$