Calculating the present values, interest rates, and number of periods.

Present Value

Present Value	Years	Interest Rate	Future Value
	8	7%	$ 13,827
	13	15	43,852
	17	11	725,380
	26	18	590,710

Interest Rate

Present Value	Years	Interest Rate	Future Value
$ 242	4		$ 345
410	8		927
51,700	16		152,184
18,750	27		538,600

Number Periods

Present Value	Years	Interest Rate	Future Value
$ 625		7%	$ 1,284
810		12	4,341
16,500		17	402,662
21,500		8	147,350