Cobalt-58 has a half-life of 71 days.How much of a 48-$\mu$g sample would remain after 284 days?

Name: Cobalt-58 has a half-life of 71 days.How much of a 48-$\mu$g sample would remain after 284 days?
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After 284 days, which is 4 half-lives (284 days / 71 days/half-life = 4 half-lives), the amount of Cobalt-58 would halve 4 times. Starting with 48 µg, after one half-life it would be 24 µg, then 12 µg, then 6 µg, and finally 3 µg after the fourth half-life.

Cobalt-58 Has a Half-Life of 71 Days μ\muμ G Sample Would Remain After 284 Days? A) 24

Cobalt-58 Has a Half-Life of 71 Days $\mu$ G Sample Would Remain After 284 Days?
A) 24