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25% x 6 lusin = 25% x (6 x 12)
= 0,25 x 72
= 18 buah
1 gros = 12 lusin = 12 lusin x 12 buah = 144 buah
12,5% x 1 gros = 12,5% x 144
= 18 buah
jadi totalnya 18 + 18 = 36 buah