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= 2(5400 + 7200 + 4800) - (5400)
= 2(17.400) - 5400
= 34.800 - 5400
= 29.400 cm = 2,94 m²
Biaya = luas x harga
Biaya = 2,94 x 80.000
Biaya = 235.200
1×p×l = 1×90 cm × 60 cm = 5400 cm² = 0,54 m²
2×p×t = 2×90 cm×80 cm = 14400 cm² = 1,44 m²
2×l × t = 2×60 cm×80 cm = 9600 cm² = 0,96 m²
0,54 m² + 1,44 m² + 0,96 m² = 2,94 m²
Biaya yg dibutuhkan = Luas kaca yang dibutuhkan × Harga kaca/meter = 2,94 × Rp 80.000,00 = Rp 235.200,00
Semoga membantu, mohon maaf jika ada kesalahan^^