Răspunsuri

2014-11-15T21:40:16+02:00
X-pretul initial
4/100*x=4x/100=>cu cat se scumpeste prima oara
10/100*4x/100=40x/10000=>cu cat se scumpeste a doua oara
x+4x/100+40x/10000=14300(aducem la acelasi numitor si anume 10000)
(10000x+400x+40x)/10000=143000000/10000   |*10000 
10000x+400x+40x=143000000
10400x=143000000
x=143000000/10400
x=13750 pretul initial
sper sa intelegi ce-am facut
multumesc dar nu asta e raspunsul este 12500
2014-11-15T21:44:16+02:00
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