Please assist with the given finance problems.
(1) A grocery store sells peanuts for $3.20 per pound and cashews for $8 per pound. The grocer wants to make 100 pounds of a mixture of peanuts and cashews that can be sold for $4.40 per pound. How many pounds of each type of nut should the grocer use?
(2) At a refreshment stand, cups of frozen yogurt are available in three sizes: small for $0.50, medium for $0.75, and large for $1.25. On Saturday, 65 small cups, 120 medium cups, and 45 large cups were sold. On Sunday, 95 small cups, 150 medium cups, and 80 large cups were sold. Use a 2 * 3 matrix, S, to represent yogurt sales and a 3*1 matrix, P, to represent yogurt prices.