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1 pengaris = 200
4 pensil = 2000
2 penggaris = 400
jadi d . 2400
3a + 5b = Rp.2.500l x 2 Ι = 6a + 10b = 5.000 -
= 0 + (-1b) = -200
-b = -200
b = Rp.200
2a + 3b = Rp.1.600l x 5 Ι = 10a + 15b = 8.000
3a + 5b = Rp.2.500l x 3 Ι = 9a + 15b = 7.500 -
= a + 0 = 500
a = Rp.500
4(500) + 2(200) = 2.000 + 400
= Rp.2.400,00