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

solution cost   : 505.011
number of trips : 4

trip 1, 13 customers, sequence : 18 23 10 11 12 8 14 9 17 7 13 16 15 
   weight    : 3625
   volume    : 13
   trip cost : 139.545

trip 2, 9 customers, sequence : 26 28 27 29 25 24 1 6 19 
   weight    : 3700
   volume    : 9
   trip cost : 184.15

trip 3, 6 customers, sequence : 22 2 5 4 3 20 
   weight    : 3925
   volume    : 6
   trip cost : 134.927

trip 4, 1 customers, sequence : 21 
   weight    : 1500
   volume    : 1
   trip cost : 46.3897