7. You are an irrigation dtrict manager who has assembled some information on demand and supply within your system- You believe demand this coming year will be w = and your total operating ciBts will be C = 7.2 x 104 + 8.23 x 109w3. Both of thcse functiorus arc expre.-a:d in units of natural water. What is the maximum amount you should bc willing to pay for a four thousand unit lease if you already have rights to sixteen thousand units?