A piece of equipment costs $30,000, and is expected to generate 9,500 of annual cash revenues and $1,000 of annual cash expenses. The disposal value at the end of the estimated 10-year life is $3,000. Ignoring income taxes, the payback period is: Select one: O a. 6.98 years. O O O o b. 3.86 years. c. 3.53 years. d. 4.29 years. e. Some other period of time not noted above