[Need explanation]

Suppose the three points in this graph illustrate a rm's expansion path: the cost- minimizing input bundles at three different levels of output. L a. For the Q = 20 to Q = 50 range of output depicted here, does the rm's production function exhibit increasing, decreasing, or constant returns to scale? Explain. (3 points) b. If the price of labor (L) is w = $10Iunit and the price of capital (K) is r = $5/unit, what is the total cost associated with each input bundle? (3 points) c. Graph the three points on the long-run total cost curve which correspond to these three points on the expansion path. ls total cost increasing at an increasing, decreasing, or constant rate? (4 points)