The document discusses calculating the recovery of the original investment for a potential purchase of an X-ray machine attachment. It outlines typical cash inflows and outflows to consider. Carver Hospital is considering this purchase but will only invest if there is an annual return of at least 10%. The document shows a present value of an annuity table and calculates that the investment exactly provides a 10% return, so it will be allowed. It also includes a quick check example to calculate the net present value of a $4,000 investment that generates $1,200 in annual cash inflows.