The management of Londo Corporation is investigating buying a small used aircraft to use in making airborne inspections of its above-ground pipelines. The aircraft would have a useful life of 5 years. The company uses a discount rate of 12% in its capital budgeting. The net present value of the investment, excluding the intangible benefits, is $395,150. (Ignore income taxes in this problem) Click here to view Exhibit 13B-2 to determine the appropriate discount factor(s) using tables. How large would the annual intangible benefit have to be to make the investment in the aircraft financially attractive?