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a)
L I = (10 - 6) × 5
L I = 4 × 5
L I = 20 m^2

L II = 1/2 × 4 × 3
L II = 6 m^2

L III = 1/2 × (5 + 3) × 6
L III = 1/2 × 8 × 6
L III = 24 m^2

Lt = L I + L II + L III
Lt = 20 + 6 + 24
Lt = 50 m^2

Jadi luas tanah keseluruhan adalah 50 m^2

b)
Ht = (20 × 150.000) + (6 × 120.000) + (24 × 140.000)
Ht = 3.000.000 + 720.000 + 3.360.000
Ht = Rp 7.080.000,00

Jadi harga keseluruhan tanah tersebut adalah Rp 7.080.000,00