6-47. The Advantgard Company plans to make a "green" investment in its forklift truck fleet. A hydrogen fuel-cell powered forklift will do the work of three battery-pack forklifts because of the time required to recharge the batteries. If the MARR is 20% per year, which type of forklift should be recommended? Use the IRR method. The salvage values of both types of trucks are negligible. (6.5.2)