----------------  SOLUTION  -------------------

solution cost   : 610.003
number of trips : 9

trip 1, 3 customers, sequence : 30 2 6 
   weight    : 67
   volume    : 3
   trip cost : 39.0814

trip 2, 4 customers, sequence : 16 23 24 12 
   weight    : 68
   volume    : 4
   trip cost : 88.9504

trip 3, 3 customers, sequence : 14 19 8 
   weight    : 62
   volume    : 3
   trip cost : 60.23

trip 4, 4 customers, sequence : 3 18 25 9 
   weight    : 67
   volume    : 4
   trip cost : 81.1359

trip 5, 2 customers, sequence : 10 11 
   weight    : 63
   volume    : 2
   trip cost : 70.1881

trip 6, 4 customers, sequence : 27 15 20 5 
   weight    : 68
   volume    : 4
   trip cost : 76.6623

trip 7, 3 customers, sequence : 1 22 28 
   weight    : 59
   volume    : 3
   trip cost : 69.3068

trip 8, 3 customers, sequence : 4 26 17 
   weight    : 68
   volume    : 3
   trip cost : 35.0842

trip 9, 4 customers, sequence : 7 13 29 21 
   weight    : 68
   volume    : 4
   trip cost : 89.3642