$(16$ points$)$ Suppose a firm's production function $is$ given $byQ=2K^{\frac{1}{2}}{L}^{\frac{1}{2}},$ where $Kis$ capital

used and $Lis$ labour used $in$ the production.

$(a)(4$ points$)$ Does this production function exhibit increasing returns $to$ scale, con$-$

stant returns $to$ scale $or$ decreasing returns $to$ scale?