@mmcdara Thanks for reply. what is u? its not e8 its 10^8. Can you also consider the range of I1 AND I2?

Question.mw

@Carl Love In earlier solution given the Q1 is a function of alpha and beta. There is a relationship between Q1 and alpha and beta. Sould we substitute that first? I just want to get for different values of I1 and I2 by considering constraints C1,C2 and C3 get different minimum TRC value. Find Q1, Q2 respectively?

Attaching sheet below :
Question.mw

Note : Consider relationship of Q1 and alpha and beta in the model.

In the sheet everything is mentioned.

@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