3. A design change being considered by Mayberry, Inc., will cost $14,000 and will result in an annual savings of $1,000 per year for the 6-year life of the project. A cost of $4,000 will be avoided at the project's end as a result of the change. MARR is 20%/y year. a) What is the present worth of this investment? [15 pts] Final answer: b) What is the decision rule for judging the attractiveness of investments based on present worth? [10 pts] Final