This question introduces you to the concept of an annuity with growth. The formulae is given on p.3, equation (7), of the Note on Formulae, but I would encourage you to try doing it in Excel as well. (If the first cash flow is C, the next one will be C(1+g), and so on, where g is the growth rate in cash flow). As an example, the present value of an annuity that starts one year from now at $100, and grows at 5%, with the last cash flow in year 10, when the discount rate is 7%, is $860. Confirm this before attempting the problem using both the formula and excel. What is the NPV of of a new software project that costs $900,000 today, but has a cash flow of $180,000 in year 1 that grows at 7.0% per year till year 20? Similar investments earn 7.6% per year.