Question

The amount of caffeine in the body of a healthy adult after drinking espresso decreases exponentially, with a half-life of approximately 666 hours. That is, every 666 hours, the amount of caffeine in the body decreases by 50\%50%50, percent. Charlotte wants to go to sleep at 11\,\text{pm}11pm11, space, p, m and does not want more than 202020 milligrams (\text{mg})(mg)left parenthesis, m, g, right parenthesis of caffeine in her system at that time. What is the latest time charlotte can drink a 222-ounce shot of espresso that contains 80\,\text{mg}80mg80, space, m, g of caffeine?

Answer 1

the amount of caffeine is 85% in this compound

Answer 2

85% of caffeine.
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