Foer each of the investments shown in the following table, calculate the rat of return earned over the unspecified time period.

Cash flow Beginning-of- End-of

Investment during period period value period value

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