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A chemical company bought a small vessel for $55,000 and it is to be depreciated by MACRS. The company's plans changed immediately after the purchase, and they leased the vessel to an oil company for 6 years at $10,000/yr. At the end of the 6th year, the oil company bought the vessel for $35,000. If the chemical company's incremental combined tax rate is 34%, what was its after-tax rate of return on the vessel? [Hint: it is close to 10%)