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Rugi = 11 1/9%
Rugi=100/9%
= 100/900=1/9
Beli - rugi = Jual
9/9Beli - 1/9Beli = 54.400
8/9Beli = 54.400
Beli = 54.400 x 9/8
Beli = Rp61.200
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Jadi, harga belinya adalah Rp 61200