a.c1:=173.26=4498.c2:=173.26=173.20+173.6=3460+1038=4498
b.c1:=(2935+1055)/5=3990/5=798.c2:=(2935+1055)/5=2935.1/5+1055.1/5=587+211=798
c.c1:=682.49=33418.c2:=682.49=682.40+682.9=27280+6138=33418
d.c1:=2442/6+16596/6=407+2766=3173.c2:=2442/6+16596/6=(2442+16596)/6=19038/6=3173