Please answer this fast:

Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he has A grade. What is the  probability that the student has 100% attendance?

(i) Write any two values reflected in this question
(ii) Is regularity required only in school? Justify your answer

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