The present serviceability index ( PSI ) of a road section has area of 1000 sq.ft is rounded to ................. If its condition ; rutting = 0.5 in , cracks length = 50 ft . , and Patching area = 5 sq . ft . where in = number of interval .... use Y = 0.0 , -0.01 , 3.68 , 0.4 , -3.3 , * 0.81 , 2.2 , -0.42 ; -3.35 , 3.02