The Minock Group, a nonprofit organization that does not pay taxes, is considering buying laboratory equipment with an estimated life of seven years so it will not have to use outsiders' laboratories for certain types of work. The following are all of the cash flows affected by the decision: Use Exhibit A.8. Required: a. Calculate the net present value of this decision. Note: Round PV factor to 3 decimal places. Negative amounts should be indicated by a minus sign. b. Should The Minock Group buy the equipment