John Black planned to have $20,000 in 20 years by making a deposit at the end of each 6 months in a bank which was then paying 4 1/2% semi-annually. At the end of 10 years the bank reduced its interest payments to 4% semi-annually. By how much must Black increase his payments in order to have $20,000 as planned? Solution www.wosco.org/.../BondEvaluation,Selection,andManagement.pdf en.wikipedia.org/wiki/Discounting check these...