Helicopter Gear is planning to expand its product line, which requires investment of $393,000 in special-purpose machinery. The machinery has a useful life of five years and no salvage value. The estimated annual results of offering the new products are as follows: Revenue Expenses (Including straight-line depreciation) Increase in net income 525,000 (499,200) 25,800 ll revenue from the new products and all expenses (except depreciation) will be received or paid in cash in the same period as recognized for accounting purposes The payback period for this proposed investment is: Multiple Choice 76 years 19 years 5.0 years