Problem 3 (25 points A power plant operator is considering an investment in increased efficiency of their plant that costs $1.2 million and lasts for 10 years, during which time it will save $250,000/ year. The investment has no salvage value. The plant has an MARR of 13%. Is the investment viable? Problem 4(25 points An oil company refines crude oil valued at $62/barrel and sells it to motorists at its retail outlets. The price is $2.90/U.S. gallon (S0.77/L). On a per unit basis (e.g, per gallon or per liter), by what percentage has the price increased going from crude oil before refining to final sale to the motorist