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Use the cash flows and competitive spreads shown in the tablebelow.($ millions)Year 0Year 1Year 2Years 3–10Investment180Production (millions of pounds per year)005999Spread ($ per pound)1.141.141.141.14Net revenues0067.26112.86Production costs0049.0049.00Transport0000Other costs0393939Cash flow–18039–20.74–24.86NPV (at r = 6%) = 0Assume the dividend payout ratio each year is 100%.a. Calculate the year-by-year book and economicprofitability for investment in polyzone production. Assumestraight-line depreciation over 10 years and a cost of capital of6%. (Negative answers should be indicated by a minus sign.Leave no cells blank - be certain to enter "0" whereverrequired. Do not round intermediate calculations.Enter your income answers in millions rounded to 2 decimal placesand enter the rate of return as a percent rounded to 2 decimalplaces.)Period:012345Book income ($)Book rate of return (%)Economic income ($)678910Book income ($)Book rate of return (%)Economic income ($)b-1. What is the economic rate of return?(Do not round intermediate calculations. Enter your answeras a percent rounded to 2 decimal places.)Economic rate of return %b-2. Now compute the steady-state book rate ofreturn (ROI) for a mature company producing polyzone. (Donot round intermediate calculations. Enter your answer as a percentrounded to 2 decimal places.)ROI %