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11. 100% = Persen buku + 25% (pensil) + 17% + 45%
100% = Persen buku + 87%
Persen buku = 100% - 87 %
Persen buku = 13 %
Jumlah buku = ×600
Jmlh buku = 13 × 6 = 78
Jmlh pensil = ×600
Jmlh pensil = 25 × 6 = 150
Jmlh buku dan pensil = 78 + 150 = 228