NASA must determine how many of three types of objects to bring on board the space shuttle

NASA must determine how many of three types of objects to bring on board the space shuttle. The weight and benefit of each of the items are given in the file P06_42.xlsx. If the space shuttle can carry up to 2600 pounds of items 1 through 3, how many of each item should be taken on the space shuttle, assuming that at least one of each is necessary?