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maaf kalau salah semoga bermanfaat
penggaris :15 %
pulpen : 25 % / 20 lusin
pensil : 20 %
25% = 20 lusin
1% = 0,8 lusin
beda pulpen dan pensil : 5 %
5 × 0,8 = 4 lusin
20 lusin - 4 lusin = 16 lusin
jawabannya C semoga membantu