After one day, `90%` radioactive sample is found. What percent of the original sample can be found after 2 days?

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Q 1241880723.     After one day, `90%` radioactive sample is found. What percent of the original sample can be found after 2 days?
A

`45%`

B

`64%`

C

`81%`

D

`72%`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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