Parking for students is very limited, and those who arrive late have to park illegally and take their chances of getting a ticket. One student kept track of his late arrivals and parking tickets over the course of the past school year. He found that he had to park illegally on 25% of the days and that he both parked illegally and received a ticket on 21% of the school days.   Find the probability that this student would receive a ticket, if he arrived late and parked illegally that day.

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