Two proposals remain for consideration that have been put forward for a hydroelectric system. Moreover, the water system of alternative 1 will cost $30 (unit $0,000) and need to be replace every 10 year indefinitely (starting end of year 10), and the water system of alternative 2 will cost $40 (unit $0,000) and will need to be replace every 15 year indefinitely (starting end of year 15). Estimate annual cost for each system which alternatives should be invested if the corporate MARR is currently 10% per year.