Table 5 Optimum results by using the convex combination method for Model-2

0.5

0.5

259.06

337.24

$x_{121}=8.51$, $x_{131}=5.51$, $x_{212}^1=10.51$, $x_{121}^1=8.51$

0.3

0.7

276.1

328.72

$x_{122}=8.51$, $x_{131}=5.51$, $x_{212}^1=10.51$

0.6

0.4

252.1

344.20

$x_{111}=6.96$, $x_{121}=8.51$, $x_{131}^1=5.51$, $x_{212}^1=3.55$