每个费用：1.2学校召开教育教学研讨会向外地发起邀请函发了十二封邀请函共花资费14.4元，平均每封邀请函的资费是多少等于14.4除以12等于1.2
急求一篇英文会议邀请函，今晚就要， Dear Professor Wang Zhengde，Our company will hold a seminar with the theme of global financial crisis and China's real estate market at second conference hall in China International Conference Center.
