6. A store wants to enclose an 800 f t 2 area outside the store. One side will be formed by the store,...

6. A store wants to enclose an 800 f t 2 area outside the store. One side will be formed by the store, two sides will be constructed of wood and the fourth side will be made of metal. If the wood costs $6 per foot and the metal is $3 dollars per foot, nd the dimensions that minimize the cost.