Question

o bicicleta se scumpeste cu 20% . Apoi cu inca 10% , costand 264 lei . Care este pretul initial?

Answer 1

x = pret initial
[tex] x + \frac{20}{100}x + x + \frac{10}{100}(x+\frac{20}{100}x) = 264 [/tex]
$2x + \frac{20x}{100} + \frac{10x}{100}+\frac{200x}{10000} = 264$
$2x + \frac{2x}{10} + \frac{x}{10}+\frac{2x}{100} = 264$
$\frac{200x}{100}+\frac{20x}{100}+\frac{10x}{100}+\frac{2x}{100}=26400/100$ |· 100
$200x+20x+10x+2x=26400$
$232x=26400$ | : 4
$58x=6600$ | : 2
$29x=3300$
$x=\frac{3300}{29}$