A car dealership offers two payment plans for an old model on discount clearance. The first plan is a down payment of 10% of the car`s original price and 5 equal monthly payments of 5% of the original price. The second plan is a down payment of 5% of the original price and 10 equal monthly payments of 4% of the original price. The cost of the first plan is what percent cheaper than the cost of the second?
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数学PS
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