返利模式

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（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 f tn f ... t f             f tn tn ... t             f tn tn ...   sumtotal n   t   f1 total   prods   prods   i i n i     prodsi prodsi t       prods.ab abf1 返利模式