A small company heats its building and spends $8,800 per year on natural gas for this purpose. Cast increases of natural gas are expected to be 10% per year starting one year from now (i.e., the first cash flow is $9,680 at EOY one). Their maintenance on the gas furnace is $360 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 $403.20 at the EOY one). If the planning horizon is 13 years, what is the total annual equivalent expense for operating and maintaining the furnace? The interest rate is 15% per year. Click the icon to view the interest and annuity table for discrete compounding when i=10% per year. Click the icon to view the interest and annuity table for discrete compounding when i=12% per year. Click the icon to view the interest and annuity table for discrete compounding when i=15% per year. The total annual equivalent expense for operating and maintaining the furnace is $ thousands. (Round to two decimal places.)