Charles Wilson is evaluating a new ticketing system for his theater. The system will cost $289,400 and will save the theater $58,086 in annual cash operating costs. Charles expects the new system to last 8 years, at which time the system will have a salvage value of $23,000. If Charles purchases the new system, he will be able to sell his existing system for $14,000. (a) Calculate the accounting rate of return for the proposed ticketing system. Accounting rate of return =?