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64.800 ÷ 36 = 1.800
jika membeli 9, berarti 9 x 1.800 = 16.200 (jawaban A)
dit = berapa jika membeli 9 buku?
jwb = 1 lusin = 12 buah
3 lusin = 36 buah
64.800/36 = 1.800
jadi, jika membeli 9 buku = 1.800 × 36
= 16.200 ( a )