@mmcdara Thankyou for reply. Can you find Q1 and Q2, and Q1a and Q2a for different value of I1 and I2 in the range given in above sheet using some loop maybe FOR Loop?

@mmcdara Thankyou for reply. I have updated an edited sheet below with file name questions to make it simple and clear:
Can you go throgh it:
Question.mw 

@acer For your understanding i am attaching a sheet below you can go through it. I have mentioned my decision variables Q1 and Q2, and for all other parameters I have given values and ranges:

I want to get optimum value of Q1 and Q2 at minimum value of TRC. 

For different value of I1 and I2 what is optimum Q1 and Q2 :-  Range of  I1 is from 0 to 5 and     range of  I2 is from 0 to 6 
Need to use FOR LOOP

Question.mw