BEIJING (AFX-ASIA) – China National Offshore Oil Corp (CNOOC) said it posted a profit of 6.44 billion yuan for the first five months of this year, up 88.6% year-on-year, and its sales rose 85.6% 19.59 billion yuan. (US$1=8.28 yuan). The company did not specify on what basis the profit was calculated. It said in a…