Direction: Read the given information carefully and answer the following question.

In Testbook, one day, the participation of all the trainees was 100%, however, every one of the trainees was not prompted to the office nor did every one of the trainees remained till the end of office time. On that day, of the trainees who showed up sooner than expected at the office, 10% of them left early, however, 30% of them left late and the rest of them left on time. Of the trainees who showed up after the expected time at the office, 30% of them left late, however, 20% of them left on time, and the rest of them left early. Of the trainees who showed up on time, 50% of them left early and 12.5% of them left late however rest of them left on time. The number of trainees who showed up before the expected time was equivalent to the number of trainees who left on time and the number of trainees who left early was 30 more than the number of trainees who showed up after the expected time at the office. The number of trainees who didn't leave on time was 156.