He also plans to purchase a solar panel system for his new home. The initial cost for the system is $10,000, and the yearly operating costs are $500. The expected saving at year 1 is unknown. In addition, since the system efficiency decays over time the amount of savings decreases by 3% every year. He would use the system for 30 years and sell it to the secondary market for $1,000. b. How much saving at year 1 makes him indifferent between purchasing the solar system and doing nothing? Write the formula you use for the calculation for full credit. (You don't need to show cashflow diagrams.) (7 points)