Helen's transportation company tries to deliver the following crops. There are a total of 600 boxes of apples, 500 boxes of bananas, 450 boxes of nectarines, and 350 boxes of peaches. These equal sized boxes can carry up to 25 pounds of apples, 35 pounds of bananas, 45 pounds of nectarines, and 30 pounds of peaches. The shipping charge for apples, bananas, nectarines, and peaches are $6.35, $6.45, $6.35, and $6.50 per box, respectively. The truck has a weight limit of 40,000 pounds and a capacity not more than 1,200 boxes.

Question 5:

What should the shipping charge per box of nectarines be changed to in order for her to deliver all of the nectarines after running the problem through Excel's Solver?