2.1 LAB: Input and formatted output: 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 caffeine amount (in mg) as input, output the caffeine level after 6, 12, and 24 hours. Use a string formatting expression with conversion specifiers to output the caffeine amount as floating-point numbers.

Output each floating-point value with two digits after the decimal point, which can be achieved as follows:
print('{:.2f}'.format(your_value))

Ex: If the input is:

100

the output is:

After 6 hours: 50.00 mg
After 12 hours: 25.00 mg
After 24 hours: 6.25 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.

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