Greg has negotiated a $20,000 price on a new pick-up truck. The manufacturer is offering a $1,500 rebate or 3.9 %, three-year financing. Greg is also able to get 7 %, three-year financing at his credit union. If Greg plans to finance $18,000 over three years, should he take the rebate or the 3.9 % financing? (Show all work.)