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3 lusin = 36 buah
pensil = 216 ÷ 2 = 108 buah
bolpoin = 36 ÷ 4 = 9 buah
spidol = 100 x 75% = 75 buah
108 + 9 + 75 = 192 buah
216 + 36 + 100 = 346 buah
346 - 192 = 154 buah