4. Sensitivity analysis for total system cost. What are the net present values, IRRs, and discounted payback period of the project when the total system cost ($16,000 AUD) varies in the range of -20% to +20% (i.e., from $12,800 AUD to $19,200 AUD)? 5. Sensitivity analysis for electricity price. What are the net present values, IRRs, and discounted payback period of the project when the electricity ($80 AUD/MWh) varies in the range of -10% to +10% (i.e., from $72 AUD/MWh to $88 AUD/MWh)