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3 buku + 4 pensil = 24.000
3 (2) + 4 = 6 +4 = 10 pensil (hitungan ke harga pensil )
10 pensil = 24.000 jadi 24.000 : 10 = 2.400 per pensil
1 buku = 2 pensil
1 buku = 2 (2.400)
1 buku = 4.800