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= 2{(9×7)+(7×4)+(9×4)}
= 2(63m²+ 28m²+36m²)
= 2× 127m²
= 254m²
biaya yang dibutuhkan = Rp 50.000,00 × 245m² = Rp 12.700.000,00
maaf kalo salah :D
Langit dan lantai(PxL) tidak dicat
LP = 2 ( PL +PT + LT)
= 2( 0 + 9x4 + 7x4)
= 2 (36+28)
=2(64)
= 128m²
biaya = 128m² x 50.000=Rp6.400.000