Răspuns :
(x-15/100x)-20/100(x-15/100x)=34
(x-15/100x)(1-20/100)=34
x(1-15/100)(1-20/100)=34
x=34/(1-15/100)(1-20/100)
x=34/0.85*0.8
x=50 lei
(x-15/100x)(1-20/100)=34
x(1-15/100)(1-20/100)=34
x=34/(1-15/100)(1-20/100)
x=34/0.85*0.8
x=50 lei