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

solution cost   : 568.562
number of trips : 3

trip 1, 14 customers, sequence : 18 19 20 22 17 14 15 16 3 2 1 6 11 12 
   weight    : 3264
   volume    : 14
   trip cost : 290.109

trip 2, 6 customers, sequence : 21 4 5 8 9 7 
   weight    : 2575
   volume    : 6
   trip cost : 210.516

trip 3, 2 customers, sequence : 10 13 
   weight    : 4350
   volume    : 2
   trip cost : 67.9375