Question

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Answer 1

The percentage of the original sample that is left after 115 days is; 23.4733%

How to calculate the decay percentage?

Formula for radioactive decay is;

A = A₀ * (1/2)^(t/t_¹/₂)

where;

A = quantity of the substance remaining

A₀ = initial quantity of the substance

t = time elapsed

t_¹/₂ = half life of the substance

Thus;

A/A₀ =  (1/2)^(115/55)

A/A₀ =  0.234733 or 23.4733%

Read more about decay constant at; brainly.com/question/11117468

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