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60% x 12000m² = 7200m²
luas kebun kopi = 15/100 x 120 = 18 m²
luas kebun karet = 90 derajat = 90/360 x 100 = 25 % , 25/100 x 120 = 30 m²
120 - 18 - 30 = 72 m²
klo gak salah