Problem 4-21 A mortgage loan in the amount of $100,000 is made at 6 percent interest for 20 years. Payments are to be monthly in each part of this problem. Complete this question by entering your answers in the tabs below. Required A Required B Required C Required D Required E Required F Required G Assume that the lender charges 3 points to close the loans in parts a (1) through a (4). What would be the APR for each? Note: Do not round intermediate calculations. Round your final answers to 2 decimal places. d1. APR if fully amortizing d2 APR if partial amortizing d3 APR if interest only d4. APR if negative amortization % % % %