A group of 9 piles arranged in a square pattern with diameter and length of each pile as 25 cm and 10 m respectively, is used as a foundation in soft clay deposit. Taking the unconfined compressive strength of clay as 120 kN/m² and the pile spacing as 100 cm center to center, find the load capacity of the group (in kN). Assume the bearing capacity factor N_c = 9 and adhesion factor = 0.75 and a factor of safety against shear may be taken as 2.5.