The average score of Zhang Ming's five exams is 88.5 points, and the full score of each exam is 100 points. In order to make the average score reach 92 points or more as soon as possible. So how many times does Zhang Ming have to take the test for full marks?
张明五次考试的平均成绩是88.5分，每次考试的满分是100分，为了使平均成绩尽快达到92分以上．那么张明再要考多少次满分？
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