2. Consider the following LP problem. Formulate the problem using Big M method. Maximize Z = 5X1 + 6X2 s.t. -2X1 + 3X2 = 3 4X1 + 8 X2 25 X1 + 2X2 s 14 X1, X2 20 What is the equivalent annual cost in years 1 through 7 of a contract that has a first cost of $70,000 in year 0 and annual costs of $15,000 in years 3 through 7? Use (a) an interest rate of 10% per year, and (b) first estimate the final worth and then calculate the equivalent annual cost