Question

Dupa doua cresteri consecutive de pret,prima de 4%,iar a doua de 10%,o masina costa 14300euro.Care a fost pretul initial al masinii?

Answer 1

x-pretul initial
 dupa cresterea cu 4%:x+4x/100=x+x/25=(25x+x)/25=26x/25
dupa cresterea 10%: 26x/25+10/100·26x/25=simplif=
=26x/25+13x/125=(130x+13x)/125=143x/125
143x/125=14300
x=125·14300/143
x=12500euro pretul initial
verificare 
dupa cresterea 4%:12500+12500·4/100=12500+500=13000
dupa cresterea cu 10%: 13000+13000·10/100=13000+1300=14300