The required percentage of students who live on campus who do not have a part-time job is 24.5%.
Given that,
At a local college, only 30% of students live off campus. Of those who live off campus, 62% of those students get a part-time job. Of those who live on campus, 65% work part-time.
The percentage is the ratio of the composition of matter to the overall composition of matter multiplied by 100.
Here,
Number of students that life in the campus = 100% - 30% = 70%
Number of students that do not have job part-time and line in  campus,
= 70% - 65%×70%
= 70% - 0.65 × 70%
= 70% - 45.5%
= 24.5%
Thus, the required percentage of students who live on campus who do not have a part-time job is 24.5%.
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