Sale out my shares and get 12 percent profit

Because last evening USA stock market downward plunge,China share market forward sourth too.When index begin downward plunge,I sale out my 600030.Remove all kinds of transaction costs,I get 12 percent profit.

I am not sure the trend of chinese market ,But I know I need protect my profit.I am glad find I do a right thing,600030 downward plunge 3% when  close the trade of today.