Răspuns :

Miky93id
x-pretul initial

20%  din x=  20/100 *x=  1/5 *x=  x/5 -marirea

x+x/5=  (5x+x)/5=  6x/5 -noul pret

20% din 6x/5=  20/100 *6x/5=  1/5 *6x/5=   6x/25 -micsorarea

6x/5 -6x/25=  (30x-6x)/25=  24x/25 -noul pret

24x/25= 19200

x=25*19200/24

x=25* 800

x=20 000

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