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22. (12 points) Alice will borrow $300,000 at 6% to buy a house. Her mortgage is for 30 years. a. How much will her monthly payment be? Assume that mortgage payments will be made monthly. b. How much interest will she pay over the life of the loan? c. How much should she pay to get out of the 6% mortgage into a 4% mortgage with 15 years remaining on the mortgage, and what will be the new monthly payment