2. In 8 "Y" grade, there are quite a few underachievers, but Vovochka performs the worst of all. The pedagogical council decided that either Vovochka must correct his failing grades by the end of the quarter, or he will be expelled. If Vovochka corrects his grades, then 24% of the class will be underachievers, but if he is expelled, the percentage of underachievers will be 25%. What is the current percentage of underachievers in 8 "Y"?

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# Solution

Let there be $n$ students in the class now. According to the condition, $0.24 n = 0.25(n-1)$, which means $0.01 n = 0.25$. Therefore, $n = 25$. One person makes up $4 \%$ of 25, so there are now $24 + 4 = 28 \%$ of underachievers.

Answer: $28 \%$.