Car payments may be calculated using this formula: monthly payment=P×(r⁢(1+r)^n)/((1+r)^n−1) Heather buys a used truck for $⁢28,000 The dealer gives her $⁢3,500 for trading in her old car, and she makes an additional down payment of $⁢1,500 She finances the rest at 8% annual interest over 48 months. What will be her approximate monthly payment?