Computing Future and Present Value Under Different Investment Assumptions

	1. If we invest $30,000 in an account at 4% interest compounded annually,
	what is the account balance at the end of five years?
	2. We wish to accumulate an investment fund of $120,000 at the end of six years
	by making a single deposit now. What amount must we deposit now assuming
	annual compounding of 6%?
	3. If we deposit $750,000 in an investment fund on January 1, which earns interest
	of 8% compounded annually, what annual payment can we withdraw each year over
	the next 20 years? Assume that our first withdrawal is at the end of the first year.
	4. If we make a payment of $1,725 each month starting today into a fund that earns 6%,
	how many months does it take to accumulate $100,000? Assume monthly
	compounding of interest.