Fun run prizes

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Aparima College had a fun run. Each of the 100 runners put their name on a piece of paper which went into a box and then names were drawn from the box to win prizes. Noa and Tula were in the fun run.


a)

One name was then drawn to receive the big prize of a TV set.
 
What was the probability that Noa won the TV set? __________

b)

The one name that was drawn was put back in the box. Twenty names were then drawn and they all won a drink bottle each.
 
What was the probability that Tula won a drink bottle? __________