show work please

4. Jack Casey is interested in buying a waterfront vacation home and has saved $300,000 for the down payment. His plans call for making additional monthly deposits into an investment account over the next 12 months. Casey wants to make the purchase 18 months from today and wants to have $400,000 saved up for the down payment. a. What is the amount of each of the additional payments he must make for his plan to work out? Assume Allen can earn 2% annual return in his investment account. b. If Casey takes out a 30-year, $1,200,000 mortgage at 5%, what will his mortgage payments be? c. Prepare an amortization schedule to prove that your answer is right and his mortgage will be paid off in 30 years