Пошаговое объяснение:
1)450 --- 100%
Х 2%
100х=450*2
100х=900
Х=900:100
Х=9
2)450 --- 100%
Х --- 20%
100х=450*20
100х=9000
Х=9000:100
Х=90
3)450 --- 100%
Х 75%
100х=450*75
100х=33750
Х=337,5
4)450 --- 100%
Х --- 120%
100х=450*120
100х=54000
Х=54000:100
Х=540
Пошаговое объяснение:
1)450 --- 100%
Х 2%
100х=450*2
100х=900
Х=900:100
Х=9
2)450 --- 100%
Х --- 20%
100х=450*20
100х=9000
Х=9000:100
Х=90
3)450 --- 100%
Х 75%
100х=450*75
100х=33750
Х=337,5
4)450 --- 100%
Х --- 120%
100х=450*120
100х=54000
Х=54000:100
Х=540