the 12-FACTOR Calculator, an Excel spreadsheet designed by author to provide the values of the 12 factors of engineering economics for arbitrary values of i, g ( ), and N Contains the ANNUAL and PRESENT WORTH COMPARISON Calculators with Component Replacements forcomparing equipment purchase quotations Defines quasi-simple investments and presents a Step-by-Step procedure for calculating their IRRs and balances Presents a classification of the four common non-simple investments and provides Step-by-Step procedures for calculating their IRRs and balances Compares the different profitability measures for the same investment: pretax IRR, aftertax IRR, aftertax sensitivity analysis, net present value, accounting rate of return, benefit-cost ratio, and payback period

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