It's difficult to predict the exact cut-off and possibilities of admission, as it depends upon the cut-off. It changes every year. It depends on the lot of factors such as the exam pattern, the number of students appeared, the number of students qualified, the highest score, whether you belong to any category or not. It varies from state to state.
You haven't mentioned the state and the category you belong to. So it's difficult to predict. Considering you as a general candidate the chances of getting admission in BA economics with 81.03 percentile seems less, for general candidate last year cut-off was 97 and for OBC it was 95 percentile.
Hope it helps