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$2\mathrm{.}18$ LAB: Introduction: Caffeine levels

A half$-$life is the amount of time it takes for a substance or entity to fall to half its original value. Caffeine has a half$-$life of about $6$ hours in

humans. Given the caffeine amount $($in mg $)$ as input, output the caffeine level after $6,12,$ and $18$ hours.

Ex: If the input is:

$100$

the output is:

After $6$ hours: $50\mathrm{.}0$ mg

After $12$ hours: $25\mathrm{.}0$ mg

After $18$ hours: $12\mathrm{.}5$ mg

Note: A cup of coffee has about $100$ mg $.$ A soda has about $40$ mg $.$ An "energy" drink $($a misnomer$)$ has between $100$ mg and $200$ mg $.$

float caffeineAmt

caffeineAmt $=$ Get next input

IT NEEDS TO BE IN CORAL NOT PYTHON OR ANY OTHER PROGRAMMING LANGUAGE PLEASE DO NOT PUT IT ANY OTHER LANGUAGE