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Turnaround time calculation

at last line -
could you explain why turnaround time for job C is 120+3?
thanks!


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Course: https://www.educative.io/collection/10370001/5371225300795392
Lesson: https://www.educative.io/collection/page/10370001/5371225300795392/5305034821599232

Thank you so much for your feedback. The issue has been fixed.