need answer for both :)

Fluorine-21 has a half life of approximately 12 seconds. What fraction of the original nuclei would remain after 1 minute? (NOTE: The question is asking for a fraction. Type your answer as \#\#\#. Example: 1/4.) At the start (time =0 ), you should use amount =1. At one half-life, amount would be 1/2. At two half-lives, amount would 1/4, etc. The half-life of protactinium-234 is 6.75 hours. What percentage of a given sample will remain after 27 hours? (NOTE: The question is asking for a percentage. Type your answer as \#\%. Example: 25%.) At the start (time =0 ), you should use amount = 100%. At one half-life, amount would be 50%. At two half-lives, amount would 25%, etc