x-pretul initial al produsului. x-16/100*x=x-4/25*x=21x/25 (pretul dupa ieftinire) 21x/25+(2/100)*(21x/25)=1285,2 ;21x/25+42x/2500=12852/10⇒ 2100x+42x=3213000⇒ 2142x=3213000⇒ x=3213000/2142⇒ x=1500 lei b) P= AB+BC+CA =8√50+7√18+4√98=40√2+21√2+28√2=89√2. √2=1,4⇒P=89*1,4=124,6 ⇒P=124,6 CM.