1.
metoda 1
10000 *30%=3000 lei
10000-3000=7000 lei
metoda 2
100%-30%=70%
10000 x 70%=7000 lei
2.
5%=5/100=1/20
20%=20/100=1/5
150%=150/100=15/10=3/2
3/4%=(3/4)/100=3/400
1,(3)%=[(13-1)/9]/100=12/900=1/75
350,(26)%=[(35026-350)/99]/100=34676/9900=8669/2475
3.
5/4=5x25/4x25 =125/100=125%
4/5=4x20/5x20 =80/100=80%
3/4=3x25/4x25 =75/100=75%
0,25=25/100=25%
0,125=12,5/100=12,5%
13,52=1352/100=1352%