I just need help with question #$4.$ I provided what the excel sheet looks like. The LCOE value for proposal #$1$ without externalites $is$ $$\frac{0\mathrm{.}14}{kWh}$ and with externalities the LCOE $is$ $$\frac{0\mathrm{.}24}{kWh}.$ The LCOE value for proposal #$2$ without externalities $is$ $$\frac{0\mathrm{.}19}{kWh}$ and with externalities the LCOE $is$ $$\frac{0\mathrm{.}20}{kWh}.$ Lastly, the LCOE value for proposal #$3$ without externalities $is$ $$\frac{0\mathrm{.}16}{kWh}$ and with externalities the LCOE $is$ $$\frac{0\mathrm{.}24}{kWh}.$