Question

Dupa doua scumpiri consecutive prima cu 25 % si a doua cu 30 % un obiect costa 200 lei. Aflati pretul initial

Answer 1

x+(x+x*1/4)*3/10=200
x+3*x/10+3*x/40=200
aducem la numitor comun:
(40*x+12*x+3*x)/40=200
55*x=8000
x=145,(45) lei