Răspuns :
S -suma depua
dobanda 5%S=5/1oo*s=S/20
S+S/20=2625
Aduci la acelasi numitor
21*S=2625*20= 52500
S=52500:21=2500 lei
dobanda 5%S=5/1oo*s=S/20
S+S/20=2625
Aduci la acelasi numitor
21*S=2625*20= 52500
S=52500:21=2500 lei
100%+5%=105% ... 2625 lei
100% ... x
------------------------------------------- sunt marimi d.p.
x = 2625*100 : 105 = 2500 lei
100% ... x
------------------------------------------- sunt marimi d.p.
x = 2625*100 : 105 = 2500 lei