租车方案费用比较：哪种方案更实惠？
翻译：The cost of the first rental plan is 5 * 2000 + 3 * 1800 = 15400 yuan. The cost of the second rental plan is 6 * 2000 + 2 * 1800 = 15600 yuan. The first rental plan is more cost-effective.
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