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10. For the small photovoltaic power plant of Table 14.1 determine: (a) The net present value for a discount rate 7%. (b) The payback period. (c) The average return on book if the straight-line depreciation is taken. (d) The internal rate of return. (e) The profitability index. Table 14.1 Yearly expenditures, revenues and cash flow for the small solar photovoltaic power plant. In thousands of \$US Fig. 14.1 Cash flow diagram for a small solar photovoltaic power plant