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36a + 12b = 69000 36a + 12b = 69000 -
60 b = 75000
b = 1250
12a + 30000 = 48000
12a = 18000
a =1500
(5x1500)+(2x1250) = 7500 + 1500 = 9000
20000-9000 = 11.000,-