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42 （万分之五）， 比如存入本金一万，第一天返回元，第二天返回元。 那么存入一万，请问天后一共返回多少钱？ 返回所有本金需要多少天？ 返回的本金需要多少天？ N th money fn total fn fn... fn total fn fn... f total f f total fn fn total fn fn... total fn fn... fn fn fn fn fn fn fn t fn t fn t t fn t t t fn fn t n fn n t n f sumn fn fn ... f tn