Marilyns parents have agreed to help her purchase a new car upon graduation in four years. They have given her two choices. The first choice is that they will give her $4,310 each year for the next four years for her to invest herself. The second choice is that they will wait four years and give her $19,610. Marilyn can invest the money at a 9% rate. Present value 2. The New Age Pet Store sells Diva Doggie pet waste disposal systems for $55 each. The systems include the unit and a one-year supply of enzyme digester waste terminator. The cost of the unit and enzyme is $39.60. The only other costs are fixed costs of $3,542. During the current period, New Age sold 620 of the units through the stores new on-line catalog division. What is the breakeven point in units? In dollars? D.What is the margin of safety in units? In dollar