A particular radioactive isotope has a half-life of 400 years. The time required for only A% of the A ,where t is the time, in 100 original amount to remain is modelled by the function t =-400log, years. a) After how many years will only 25% of the original amount of radioactive isotope remain? (3) b) After 20 years, what percent of the original amount of radioactive isotope remains? (3)

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