There is a kind of reptile in Africa. Its growth period is very special. It starts from the fifth day after birth until it grows into an adult, and its length doubles every day compared with the previous day. The staff measured its length on the tenth day after its birth to be 896 cm. So, what is its length in centimeters on the seventh day after birth?
非洲有一种爬虫，牠的成长期是很特别的，牠由出生后第五天开始，直至成长至成虫，每天长度较上一天增加一倍另多一厘米．工作人员在牠出生后第十天量度得牠的长度是896厘米．那么，牠出生后第七天的长度是多少厘米？
<result>112.125</result>