问题描述：
这句话有没有语法错误?应该怎么改?
the percentage of the people who have interest in subject is twice that of enjoying learning and to improve prospects of promotion.the ratio is 40% to 20%.
the percentage of the people who have interest in subject is twice that of enjoying learning and to improve prospects of promotion.the ratio is 40% to 20%.
问题解答：
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