Q3 Calculate the cost for excavating a raft foundation with dimension (100 x 100 x 1.25) m in a clay soil using a bulldozer, if you know the following information: Operating factor = 50 Speed during excavating the foundation = 4 km/hr. Speed in return = 8 km/hr. Distance of soil transfer is 50 m Swelling percentage (Sw)= 22% Fixed time=0.32 min. Bulldozer blade size = (2.5 x 1)m. Working hours = 8 hr. per day. Cutting cost of rent the bulldozer = 300 x 103 ID/day (15 Marks)