Hello,
Cutoff 30.49 out of 100 means 30.49 marks. For example, 100 vacancies, 300 members are to be selected. In the examination result, let the top marks be 86/100, and 300th candidate scored 30.49/100.
Here, 300 members are enough. Hence, marks of last eligible candidate for further process are called cutoff marks. Here, they are 30.49 .
Hope this helps.
Good luck!
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