Hello aspirant,
As per your question i do understand your question.
In order to get admission in DU for honors a student must include the subject in which the student aspires to do honors.
As in your case you want to go honors in eco so eco should be a subject included in your best four.
English+chem+phy+eco=90%

English, maths , economics are  to be  compulsory included so 

Your best 4 is 

Eng maths physics eco 

Also u got same marks in both phy and chemistry so anything is considered

91+91+91+77/4

87.5 is your best 4 score

Hi aspirant
According to the lastest judgement DU is following the last year criteria for admission in eco hons.
With says you must hv studied maths in 12th but it's not compulsory to add it in your bfs.
So to calculate your best four percentage add up
Eng+ eco+ physics and chemistry
91+87+91+91/4 making it 90%

All the best

DU Delhi

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