## Task 1 - 240811

At a school, a waste collection campaign is being conducted in grades 5 to 10. During the subsequent evaluation for a competition between the grade levels, the following is observed:

The students of grade 9 collected waste worth $42 \mathrm{M}$; the students of grade 10 collected the same amount. The grade 8 students achieved twice as much as the combined efforts of grades 9 and 10. The students of grade 5 reached $21 \%$ of the total school result; grade 6 contributed $30 \%$ of the total school result, and grade 7 achieved $2 \%$ less of the total school result than grade 6.

What is the total result of the school according to these findings?
According to the findings, grades 8, 9, and 10 together contribute

$$
100 \%-21 \%-30 \%-28 \%=21
$$

of the total result. On the other hand, these were secondary materials worth

$$
42 M+42 M+2 \cdot(42 M+42 M)=252 M
$$

Since $252: 21=12$, $12 \mathrm{M}$ thus represents $1 \%$ of the total result; therefore, the total result is $1200 \mathrm{M}$.