what is the formula to grow the electricity cost for years 2 to 5. the answer for year 2 electricity cost is 0.1751. what is the formula used to get this value?

WELLS FARGO: SOLAR ENERGY FOR LOS ANGELES BRANCHES Pro Forma Economic Model Size, kW cost per kW Efficiency rating annual degradation 15 kW $7,000 S per kW 18% % 0.50% % Total cost 105.000 end-of-life salvage 15% value to depreciate 89.250 SIP rate system rating design factor $1.95 per W 12585 W 0.9 tax rate tax credit 38% of profits 30% of system cost $0.17 per kWh Electricity cost annual increase 3% 1.369 maintainance annual increase $15 per kW 2% 0.30% of total cost 2% insurance annual increase hurdle rate 3.53% year What's Cash flows for 5 years? electricity cost electricity generation electricity cost savings $0.17 $23,652.00 $4,020.84 ? 2.6865 23416.0713 23298.9909 23182.49599 ? ? ? S15 maintainance cost per kW total maint cost insurance cost total insurance 0.30% 315 total cost savings tax on cost savings