Question

Dupa doua reduceri consecutive de pret, prima de 4%, iar a doua de 5%, un obiect costa 820,8 lei.Aflati pretul initial al obiectului.

Answer 1

100%-5%=95%
820,8:95%=820,8 :95/100=820,8 *100/95=864 lei

100%-4%=96%
864:96%=864:96/100=864*100/96=900 lei pret initial

Answer 2

x-4/100x=820.8⇒100x-4x=820.8⇒96x/100=820.8⇒96x=82080⇒x=82080/96⇒x=855
x-5/100x=820.8⇒100x-5x/100=820.8⇒95x/100=820.8⇒95x=82080⇒x=82080/95⇒x=964
sucees