A small company heats its building and spends $8, 800 per year on natural gas for this purpose. Cost increases of natural gas are expected to be 8% per year staring one year from now (i.e, the first cash flow is $9, 504 at EOY one). Their maintenance on the gas furnace is $355 per year, and this expense is expected to increase by 12% per year starting one year from now (i.e., the first cash flow for this expense is $397.60 at the EOY one). If the planning horizon is 15 years, what is the total annual equivalent expense for operating and maintaining furnace? The interest rate is 15% per year. The total annual equivalent expense for operating and maintaining the furnace is thousands