A rectangular building is to be constructed with a curtain wall parallel to the front that will divide the building into a sales area of 1500 m2 and a storeroom of 500 ml. The outside walls at both sides and across the back will cost SlOO/m the curtain costs $45/m. The front wall made of glass will cost S345/m. Calculate the dimensions of the rectangular building that gives the required area at the lowest cost for the walls. SET UP EQUATION