去美国一所中等的大学进修平均需要多少RMB

30万RMB

这要看学校的好坏，大约1学期10万左右，但可能更少，而且可以申请奖学金

It depends on the State. Some are more expensive, e.g. California, Illinois, Michigan, New York. 250,000 RMB should be sufficient.

Cheaper states (both tuition and living costs) are in the south or east of the Rockies, e.g. Louisana, Arizona. 180,000 should be enough.

Don't count on scholarship, unless you are amongst the top 3% in China.