Radioactive iodine−131 (t1/2 = 8.0 days) decays to form xenon−131 by emission of a β particle. How much of each isotope

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Radioactive iodine−131 (t1/2 = 8.0 days) decays toform xenon−131 by emission of a β particle.
How much of each isotope is present after each time interval if48 mg of iodine−131 was present initially:
(a) 8.0 days; (b) 32 days?
(a) _____ mg of iodine−131, _____ mg of xenon−131(b) _____ mg of iodine−131, _____ mg of xenon−131