1. The maintenance cost for equipment has been $10,000 per year for the past six years. The interest rate was 6% per year compounding monthly for the first two years, 7% for the third year, and 8% per year compounding quarterly for the last three years. What is the equivalent maintenance cost at now? 2. A group of concerned citizens has established a trust fund that pays 12% interest compounded monthly to preserve a historical building by providing annual maintenance funds of $20,000 forever. How much do they need to start the trust fund? 3. Giving the following manually exclusive alternative, which one is preferable if the interest rate is 6% per year. Initial Cost $350 $90 $400 $450 $120 $42 Annual Benefits Salvage Value Useful life, in years $100 $50 $38 3 4