China’s stock market opened at $2,742 a share at 7:40 p.m.ET (4:40 a.m., Beijing time) on Tuesday, a sharp decline from Tuesday’s closing price of $3 and a five-month high of $2.766 a share.The Shanghai Composite Index (SCI) was at $5,200.50, up 11.3 percent from the previous close of $4,812.50 a share and the longest…