单选题
During the four years that Mrs. Lopez owned her car, she found that her total car expenses were $18,000. Fuel and maintenance costs accounted for 
of the total and depreciation accounted for 
of the remainder. The cost of insurance was 3 times the cost of financing, and together these two costs accounted for 
of the total and depreciation accounted for of the remainder. The cost of insurance was 3 times the cost of financing, and together these two costs accounted for
【正确答案】
D
【答案解析】[解析] 设分期付款费为x，则保险费为3x，根据题意可得：
税款和执照费用
税款和执照费用