21. Using the PPC and the information on the curve, as shown, to answer the question: 500 4509 Crab Puffs OM 400 350 300 250- 200 150 100 SC 2 5 7 8 9 10 11 Storage Shade The opportunity cost of increasing storage sheds from points L to J is: O 200 09 05 OO O cannot be computed based on information provided22. The PPC as shown in Question #21 above is eye and it illustrates the law of opportunity cost. O convex ; decreasing O concave ; constant O convex ; increasing O concave ; decreasing concave ; increasing