A trader's book has a Delta of +50,000 and a Gamma of -5,000. If the underlying asset goes up by $2, what is the new approximate Delta? Also, if the trader wants to neutralize both Delta and Gamma, in what sequence should they execute the trades?

一个交易员的期权组合目前Delta是+50,000，Gamma是-5,000。如果标的资产价格上涨2美元，新的Delta大约是多少？如果交易员想把Delta和Gamma都对冲到零，应该按什么顺序操作？