Exercise 2.5 How long will it take to double a capital attracting interest at 6% com- pounded daily? Exercise 2.7 Find and compare the future value after two years of a deposit of $100 attracting interest at a rate of 10% compounded a) annually and b) semi- annually. Exercise 2.9 What initial investment subject to annual compounding at 12% is needed to produce $1,000 after two years?