Open Question: If the half-life of fluorine-18 is 110 minutes, then approximately what percentage of a sample will remain...?
After 110 minutes, 50% will be left.
After 220 minutes, 25% will be left.
After 220 minutes, 25% will be left.
However, you want it after 200 minutes. Because 25% is left after 220 minutes, after just 200 there will be a bit more than 25% left.
The only answer that fits this is 28%. It can't be 25% or less than 25%, and we already worked out that 50% would be left after just 110 minutes.
So the answer is A, 28%.
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