I tried solving this problem 
Here is my cplex code
I have mentioned stored[month] as float+ but in the final result I get negative values. What is wrong with my model? 
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1$\begingroup$ Why in objective function you have $\rm demand \times 0.3$? Shouldn't be $\rm stored \times 0.3$? $\endgroup$ – Mostafa Apr 15 '20 at 11:37
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2$\begingroup$ In the future, please use code blocks rather than screenshots. It makes it much easier for us to read, and also for us to copy and paste into our own systems to test and debug your code. $\endgroup$ – LarrySnyder610♦ Apr 15 '20 at 15:22
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you get negative values because your model is relaxed by cplex since it is not feasible. You should debug it. Your
if (i==i)
looks very strange, I would change one i into 1
Plus to get help try to copy / paste code instead of screenshots
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$\begingroup$ It was a mistake I changed it to if (i==1) , it worked , thanks $\endgroup$ – sudarsan vs Apr 15 '20 at 11:37
