Răspuns:
Explicație pas cu pas:
12) 1-10/100 = 1-1/10 = 9/10
9/10 - 9/10*20/100 = 9/10 - 9/10*1/5 =
(45-9)/50 = 36/50 = 72/100
Proc. = 72%
13) Suntem in cazul 12) :
1440/72*100 = 2000
14) x = salariul
12x/100 + 15/100(x+12x/100) = 720
1200x + 1680x = 720*100*100
1880x = 7200000
x = 2500
15) y - 20y/100 = 88
100y - 20y = 8800
80y = 8800
y = 110
x + 10x/100 = 110
100x + 10x = 110*100
110x = 11000
x = 100 pret initial
