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Biaya penembokan adalah:
Biaya penembokan adalah Rp 192 000
24=4s
s=24 : 4 = 6.
panjang sisi ruangan = 6 m.
Luas 1 dinding = 6 × 4 = 24 m².
luas 4 dinding = 4 × 24 = 96 m².
Jadi, biaya penembokan keempat dinding = 96 × 2000 = Rp 192.000.