A + B + C + D = 23000
0.8A = 0,6B = 0,72C = 0,48D
B = 8A/6 = 4A/3 = 12A/9
C = 80A/72 = 10A / 9
D = 80A/48 = 10A / 6 = 5A/3 = 15A/9
9A/9 + 12A/9 + 10A/9 + 15A/9 = 23000
46A/9 = 23000
A = 23000 x 9 / 46 = 4500 lei
B = 4 x 4500 / 3 = 6000 lei
C = 45000/9 = 5000 lei
D = 5 x 4500 / 3 = 7500 lei