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Verified answer
A + b = 90a = 90 - b
4a + 2b = 290
4(90-b) + 2b = 290
2b = 360-290
b = 70/2 = 35
a = 90-35 = 55
pendapatan = 55x5.000 + 35x2.000
= 275.000 + 70.000
= 345.000