x Pret
reducere1
x-10x/100=RED1
x-x/10=Red1
Reducere 2:
red1-red1 15/100=1377
red1-3red1/20=1377 Amplificam cu 20 pt a avea ac. numitor
20 red1-3 red1=27540
17 red1=27540
red1=1620
x-x/10=Red1
x-x/10=1620
10x-x=16200
9x=16200
x=1800 lei
Pret initial=1800