Consider the following 2 retirement plans. Upon retirement, Plan A will pay $300 per month plus an additional $80 for each year a person works for the company prior to retirement. Plan B will pay $700 per month plus an additional $20 per year for each year a person works for the company prior to retirement. Whom among the following would be best off choosing retirement Plan B?

: a) Stefano, who is joining the company and plans to retire in 5 years b) Mary, who is joining the company and plans to retire in 15 years c) Pierre, who is joining the company and plans