1) 2.38 * 50.4 = 120
2) 3.04 * 5.9 = 18
3) 29.2 * 5.12 = 150
4) 9.38 * 0.64 = 6
5) 4.02 * 99.4 = 400
6) 41 * 1.95 = 80
7) 0.99 * 30.6 = 30
8) 2.8 * 74.9 = 210
Пропорция
60 - 100%
52,80 - х
х = 52,80 * 100 / 60 = 88 %
скидка 12 %
15y-24=0
3y -9/10=0
y=8/5
y=3/10