4. A builder must construct a showroom that will be divided into offices, with the front of the building built out of glass. The brick walls all cost $1200/m while the glass wall costs $500/m. The total area must be 12000 sq. m. Determine the dimensions that will minimize costs. 5. Java Hut sells espresso for $2.50 and sells 500 a day, a feasibility study indicated that for every .25 increase in price they will lose 25 sales. Determine the price and quantity that will maximize revenue.