14. The Stein family wants to buy in a year and a half a small vacation house that is expected to cost $75,000 at that time. The family has the following sources of money. 1. The family currently has $10,000 in a bank account that pays 6% compounded monthly 2. Uncle Murray has promised to give the family $1,000 a month for 18 months starting today. 3. At the time of purchase, the family will take out a mortgage. The Stein family anticipates being able to make payments of about $300 a month on a 15-year, 12% loan. In addition, the family plans to make quarterly deposits to an investment account to save up any shortfall in the amount required. How much must those additions be if the investment account pays 8% compounded quarterly