The Fallwing family loves gummy bears and pickled strawberries. Their monthly GB/PS utility function is given by U(x, y) = 13 ln x + 7 ln y, where x = the number of pounds of gummy bears and y = the number of pounds of pickled strawberries that they consume each month. (a) (4 pts) Find the quantities of gummy bears and pickled strawberries that the Fallwing family should consume to maximize their GB/PS utility, given that gummy bears cost $8.00/pound, pickled strawberries cost $6.00/pound, and the Fallwing's monthly GB/PS budget is $480.00. What is their maximum monthly GB/PS utility? (b) (1 pt) Show how you know that the GB/PS utility that you found in (a) is the Fallwing's absolute maximum.