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25) Ls.kamar tidur utama = 3 x 150 x 5 x 150
= 337500 cm²
= 33,75 m²
Ls kamar tidur anak = 3 x 150 x 3 x 150
= 202500 cm²
= 20,25 m²
luas keramik = L.total kamat tidur
= 33,75 + 20,25
= 54 m² ..... jawaban : D