Question

Dupa doua reduceri consecutive de pret, prima cu 4%, iar a doua cu 5%, un obiect costa 136, 8 lei.Aflati pretul initial al obiectului.

Answer 1

Prima reducere x - 4 / 100 *x  = (100*x -4*x)/100=96/100*x

A doua reducere y-5/100*y= (100*y-5*y)/100=95/100*y

acum inmultim cele doua reduceri  (96/100*95/100)*z=136,8

=>9120/10000*z = 136,8 => 912*z =136800 => z = 150 lei

Answer 2

X- pretul initial x-4x/100 - 5/100*(x-4x/100)= 136,8 100x/100 - 4x/100 - 5/100*(100x/100-4x/100)=136,8 96x/100-5/100*96x/100=136,8 96x/100-480x/10000=136,8 9600x/10000-480x/10000=1368000/10000 9600x-480x=1368000 9120x=1368000 x=1368000/9120=150 lei