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Explanation:

Please note that the best way to solve this question is by working backwards.
E.g. after the 4th round, each one of them had Rs.32. Since it is Vibha who lost in this round, all the remaining three must have doubled their share.
In other words, they would have had Rs.16 each after the 3rd round.
Since the increase is of Rs.16 in each one’s share, i.e., Rs.48 overall which comes from Vibha's share, her share before the 4th round was (32 + 48) = Rs.80, after the 3rd round.
Working backwards in this manner, we can get the following table.

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​​​​​​​At the end of the second round, Uma had Rs.72.

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