Culver Company is considering investing in new equipment that will cost $1,428,000 with a 10 -year useful life. The new equipment is expected to produce annual net income of $35,700 over its useful life. Depreciation expense, using the straight-line rate, is $142,800 per year. Compute the cash payback period. (Round answer to 1 decimal place, e.g. 15.2.) Cash payback period years