a) 100%+20%=120%
120/100 % × X = 67200
X = 67200 × 100/120 %
X = 560 ×100
X = 56000 (pret initial )
b) 100% + x% = p%
P/100 % + 67200 =56000
P672 =5600
P = 56000 ÷ 672
P= 83, (3)
100 - x = 83, (3)
X = 100/ 1 = 83 intregi 3/9 = 100/1 =350/3= 300/3 = 250/3 =50/3
C) 100% + 5 =105%
100% +25 = 125%
105/100% × 125/100% × x = 67200
105/80 × x = 67200
X= 67200 ÷ 105/80
X= 67200 × 80/ 105
X= 640 × 80
X = 51,200
SPER CA TE-AM AJUTAT ! :)