Question

proglema. dupa o reducere de 20% o carte costa 96 de lei.determina pretul carti inainte de reducere.

Answer 1

$x \to pretul \ initial \\\\ 20\% \ din \ x= \frac{\not 20}{\not 100}*x= \frac{1}{5}*x \to \frac{x}{5}-reducerea \\\\ x^{(5}-\frac{x}{5}=\frac{5x-x}{5}\to \frac{4x}{5} \\\\\\ \frac{4x}{5}=96 \\\\ x=\frac{5* \not 96}{\not4} \\\\ x=5*24 \\\\ \boxed{x=120 \ lei}$