Table 1 Hybrid unit transportation cost

${\tilde{\widehat{C}}}_{111}$

(7, 8, 9) + (2, 0.2)

${\tilde{\widehat{C}}}_{211}$

(5, 8, 10) + (12, 0.3)

${\tilde{\widehat{C}}}_{311}$

(6, 9, 10) + (13, 0.7)

${\tilde{\widehat{C}}}_{121}$

(10, 12, 13) + (14, 1.6)

${\tilde{\widehat{C}}}_{221}$

(15, 16, 17) + (11, 2.3)

${\tilde{\widehat{C}}}_{321}$

(1, 2, 3) + (1, 0.1)

${\tilde{\widehat{C}}}_{131}$

(10, 12, 14) + (5, 1.5)

${\tilde{\widehat{C}}}_{231}$

(15, 17, 19) + (8, 0.7)

${\tilde{\widehat{C}}}_{331}$

(7, 10, 12) + (12, 1.3)

${\tilde{\widehat{C}}}_{112}$

(8, 12, 14) + (14, 2.33)

${\tilde{\widehat{C}}}_{212}$

(5, 7, 10) + (7, 1)

${\tilde{\widehat{C}}}_{312}$

(7, 8, 9) + (14, 0.7)

${\tilde{\widehat{C}}}_{122}$

(11, 12, 14) + (9, 1.2)

${\tilde{\widehat{C}}}_{222}$

(17, 19, 21) + (19, 0.9)

${\tilde{\widehat{C}}}_{322}$

(19, 20, 21) + (11, 1.4)

${\tilde{\widehat{C}}}_{132}$

(17, 18, 22) + (12, 1.7)

${\tilde{\widehat{C}}}_{232}$

(9, 13, 15) + (15, 0.75)

${\tilde{\widehat{C}}}_{332}$

(6, 10, 11) + (8, 1.35)