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Bismath decomposes at a rate proportiona...

Bismath decomposes at a rate proportional to the quanitity of the substance present. If initial mass of substance is 800 mg. and its half life is of 5 days, then the mass of bismath after 30 days is

A

12.5 mg

B

25 mg

C

6.25 mg

D

18.75 mg

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The correct Answer is:
A
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