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sari = s
A. r - s = 5000
4r + 3s = 90.000
B. r = 5000 + s
4r + 3s = 90.000
20.000 + 4s + 3s = 90.000
7s = 70.000
s = 10.000
maka r = 5000 + 10.000 = 15000
c r + s = 15000 + 10.000 = 25000