A lоcаl lаwncаre service is cоntemplating replacing an оlder leaf collector/shredder with a new more powerful unit. While the old unit works, employees frequently complain about how easily the existing unit clogs, constant breakdowns, and how noisy it is. A new unit is expected to solve all of these problems. However, because the leaf collector/shredder is only used for 2 months a year, the lawncare service's owner is uncertain if buying the new unit is sensible. Repairing the existing unit requires an average of ${fi} for the year and the operating costs are ${vi} an hour when it is working. A new unit can be leased for ${fo} per year and will cost ${vo} per hour to operate. What is the crossover point in hours for these 2 options? (round your answer to the nearest whole number) (online calculator Desmos)