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Nu-mi dau seama unde am gresit.Obtin fractie periodica....

Numi Dau Seama Unde Am GresitObtin Fractie Periodica class=

Răspuns :

pret final 420 lei
cresterea 20 %    100%+20%=120%
420:120%=420 :120/100= 420 × 100/120=350 lei

scaderea 30 %    100%-30%=70%
350:70%=350:70/100=350×100/70= 500 lei  pret initial