Living organisms contain a certain amount of carbon-14. After death, this amount decays according to the equation in Exercise 69 (this is used in carbon-14 dating). What percentage of an organism’s carbon-14 is still present 2580 years after death?

Data from In Exercises 69

Carbon-14 has a half-life of approximately 5730 years. If A₀ is the original amount present, then the amount present after t years is given by A(t) =  A₀2^−t/5730 , If 55.0 mg is present initially, how much is present after 3250 years?