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5b + 4j = 50.000 ........ selanjutnya dikali 2 (untuk menyamakan b menjadi 10)
2b + 3j = 27.000 ........... selanjutnya dikali 5
10b + 8j = 100.000
10b +15j= 135.000
________________ -
-7j = - 35.000
7j = 35.000
j = 35.000 / 7 = 5.000
maka b.....
2b + 3 (5.000) = 27.000
2b + 15.000 = 27.000
2b = 12.000
b = 6.000
maka yang dibayar Andri
3 (6.000) + 2 (5.000)
= 18.000 + 10.000
= 28.000 (C)