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

solution cost   : 607.651
number of trips : 8

trip 1, 4 customers, sequence : 9 8 11 12 
   weight    : 48
   volume    : 4
   trip cost : 78.274

trip 2, 4 customers, sequence : 20 21 13 16 
   weight    : 48
   volume    : 4
   trip cost : 101.748

trip 3, 2 customers, sequence : 19 15 
   weight    : 45
   volume    : 2
   trip cost : 69.3594

trip 4, 4 customers, sequence : 2 4 25 10 
   weight    : 47
   volume    : 4
   trip cost : 100.247

trip 5, 3 customers, sequence : 17 5 7 
   weight    : 48
   volume    : 3
   trip cost : 68.3142

trip 6, 3 customers, sequence : 22 18 24 
   weight    : 46
   volume    : 3
   trip cost : 88.7666

trip 7, 1 customers, sequence : 3 
   weight    : 41
   volume    : 1
   trip cost : 29.5296

trip 8, 4 customers, sequence : 14 6 1 23 
   weight    : 44
   volume    : 4
   trip cost : 71.4123