optimization models

Suppose that a hiker going on a trip is trying to chose snacks to take with him so that they'll occupy the smallest space possible, as long as they cover some requirements. The table below shows the items being considered. Protein Item Volume (ft) 0.2 00 1 12 2 0.3 30 3 3 0.2 15 4 0.4 20 5 0.3 10 Write a model that selects the items that should be taken if the hiker needs to carry at least P grams of protein. Add the necessary modifications to (a) assuming each item i has a cost , and the hiker has only $B to purchase them