I spent 200 yuan to buy a bike

不可以
可以有如下的表示“
I spent 200 yuan（ in） buying a bike
I spent 200 yuan on a bike
I paid 200 yuan for a bike
A bike cost me 200 yuan
spend的主语必须是人,常用于以下结构：
(1) spend time ／money on sth.在……上花费时间（金钱）.例：I spent
two hours on this maths problem.这道数学题花了我两个小时.(2) spend time ／ money (in) doing
sth.花费时间（金钱）做某事.例：They spent two years (in) building this bridge.
造这座桥花了他们两年时间.
(3)spend money for sth.花钱买…….例：His money was spent for books.
他的钱用来买书了.

不对 应该是 on buying

不对
spend 后可加(in) doing 或on sth.
不可以跟不定式

this is correct

应该说：I spent 200 yuan buying a bike.