Your company has purchased a new excavator for $250,000. The excavator can be billed out at $200 per hour, has an hourly operation cost of $110 and a useful life of six years. At the end of six years, the excavator has a salvage value of $45,000. The operator cost is $40 per hour. Using a MARR of 20% and AE method, what is the minimum number of hours that must be billed each year in order for your company to break even? (Hint: Equate AE = 0 and solve for unknown)