Cene pewnego towaru obnizono o 10%, a nastepnieo15%. O ile procent trzeba podniesc cene towaru by powrociła do poczatkowej ceny?
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x-0.1x=0.9x
0.9x-(0.9x*0.15)=0.9x-0.135x=0.765x
x-0,765x=0.235x
0.235/0.765 *100%=30,72%