Question

In urma a 2 majorari succesive, pretul unui produs a devenit 990 lei.Pretul initial era de 750 lei,iar a doua majorarea a fost de 10%>>>>>>>>>>a)Determinati pretul dupa prima majorare.>>>>>>b)Cu fe procent s a realizat prima majorare?

Answer 1

Pret initial = 750
pret final = 990

$x + \frac{10}{100}x = 990 =\ \textgreater \ x + \frac{x}{10} =990 =\ \textgreater \ \frac{10x}{10} + \frac{x}{10} = 990 =\ \textgreater \ \frac{11x}{10} = 990 =\ \textgreater$
=> 11x = 9900 => x=900 (pretul dupa prima majorare)

$750 + \frac{x}{100} 750= 900 =\ \textgreater \ \frac{75x}{10}= 150 =\ \textgreater \ 75x=1500=\ \textgreater \ x=20$
x=20%