3000*(1-x/100)²=2430
(1-x/100)²=2430/3000
(1-x/100)² = 0,81
(100-x)/100 = 0,9
100-x = 90
x = 100 - 90
x = 10%
Два снижения по 10%
3000*(1-x/100)²=2430
(1-x/100)²=2430/3000
(1-x/100)² = 0,81
(100-x)/100 = 0,9
100-x = 90
x = 100 - 90
x = 10%
Два снижения по 10%