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b. 3 lusin = 3 x 12 = 36
162.000/36 = Rp. 4500
c. 1 gros =12 lusin = 12 x 12 = 144
Rp. 108.000 / 144 = Rp. 750
d. Rp. 472.000.000/40 = Rp. 11.800.000