P82 Return calculations?For each of the investments shown in the following table, calculate the rate of return earned over the unspecified time period.

Investment	Cash flow during period	Beginning-of-period value	End-of-period value
A	2$??800	$?1,100	$?? 100
B	15,000	120,000	118,000
C	7,000	45,000	48,000
D	80	600	500
E	1,500	12,500	12,400

Problem P8-2:
	Investment	Cash Flow During Period	Beg of Period Value	End of Period Value	Rate of Return
	A	(800)	1,100	100
	B	15,000	120,000	118,000
	C	7,000	45,000	48,000
	D	80	600	500
	E	1,500	12,500	12,400