Dear Aspirant,
yes you will be able to pursue your under graduation degree of BCom in the stream of economics. BCom admission does not have any eligibility criteria as of yet with respect to streams. Hence you are eligible to pursue a degree in BCom in Economics. However, regarding the percentage, it depends on the college you are interested in. Every college has a different cutoff percentage based on which they provide admission. You can visit the official website of the college of your preference and see their cutoff percentage.
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