A piece of equipment costs $31,000, and is expected to generate $8,600 of annual cash revenues and $1,900 of annual cash expenses. The disposal value at the end of the estimated 9-year life is $2,000. Ignoring income taxes, the payback period is:

A. SOME OTHER PERIOD OF TIME NOT NOTED

B. 4.33 YEARS

C.6.30 YEARS

D.3.60 YEARS

E.4.63 YEARS