Question $5(4$ points$)$

A service facility has four workcenters. Each workcenter is of same size and shape $($length $=$ width $=20$ feet$).$ The size of the whole facility is $80$ feet $x20$ feet $($length $=80$ feet and width $=20).$ How many unique layouts are possible? $[$Select the appropriate range in which your answer falls.$]$

More than $0$ but less than or equal to $10$

More than $10$ but less than or equal to $50$

More than $50$ but less than or equal to $100$

More than $100$ but less than or equal to $150$

More than $150$