8.2. In 8th grade class "G", there are enough underachievers, but Vovochka studies the worst of all. The pedagogical council decided that either Vovochka must correct his twos by the end of the quarter, or he will be expelled. If Vovochka corrects his twos, then the class will have $24 \%$ of underachievers, and if he is expelled, the underachievers will become $25 \%$. What percentage of underachievers are there in 8 "G" now?
8.2. Let there be $n$ students in the class now. According to the condition,

$$
0.24 n = 0.25(n-1)
$$

i.e., $0.01 n = 0.25$. Therefore, $n = 25$. One person constitutes $4\%$ of 25, so there are now $24 + 4 = 28\%$ of underachievers.

Answer: $28\%$.