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Verified answer
1 lusin = 12 buahHarga jual 1 lusin bolpoin
= 12 x Rp.4.000
= Rp.48.000
Keuntungan
= Harga jual - harga beli
= Rp.48.000 - Rp.39.600
= Rp.8.400
Jadi, keuntungan sebesar Rp.8.400