Chatham Automotive purchased new electric forklifts to move steel automobile parts two years ago. These cost $75 000 each, including the charging stand. In practice, it was found that they did not hold a charge as long as claimed by the manufacturer, so operating costs are very high. This also results in their currently having a salvage value of about $10 000. Chatham is considering replacing them with propane models. The new ones cost $58000. After one year, they have a salvage value of $40 000, and thereafter decline in value at a declining-balance depreciation rate of 20 percent, as does the electric model from thi:s time on. The MARR is 8 percent. Operating costs for the electric model are $20 000 over the first year, rising by 12 percent per year. Operating costs for the propane model will initially be $10 000 over the first year, rising by 12 percent per year. Should Chatham Automotive replace the forklifts now