♥Awesome Probability♥

Discrete Mathematics Level pending

A student is not be able to remember the last digit of his private tutor's cell number at the time of urgency.Unfortunately his mobile battery is also down & his house is under the situation of power cut at that time.He could only try that cell number at most 4 times and then his mobile will be switched off.

What is the probability that he is able to dial the correct number before his mobile gets switched off?
(Give the answer as % in number e.g., if your answer is 50% then write 50)

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