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

solution cost   : 535.797
number of trips : 3

trip 1, 7 customers, sequence : 20 3 4 1 5 2 22 
   weight    : 4225
   volume    : 7
   trip cost : 149.998

trip 2, 8 customers, sequence : 26 28 27 29 25 24 6 21 
   weight    : 4500
   volume    : 8
   trip cost : 216.82

trip 3, 14 customers, sequence : 18 23 10 11 12 8 14 9 17 7 13 16 15 19 
   weight    : 4025
   volume    : 14
   trip cost : 168.979