Problema 5 .....ofer si corona

Răspuns:

Explicație pas cu pas:

P = pretul initial

P*90/100*90/100 = 162

P = 162*100*100/(90*90) = 200 lei

x-pret initial

[tex]x \times \frac{10}{100} = \frac{1}{10} x [/tex]

[tex]x - \frac{1}{10}x = \frac{9}{10} x [/tex]

(prima reducere)

[tex] \frac{9}{10} x \times \frac{10}{100} x = \frac{9}{100} x[/tex]

[tex] \frac{9}{10} x - \frac{9}{100} x = \frac{81}{100} x[/tex]

(a doua reducere)

Pretul initial:

[tex] \frac{81}{100} x = 162 = > x = \frac{162 \times 100}{81} = 200[/tex]

pret initial:200 lei