6. The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in
A. 24 days
B. 36 days
C. 40 days
D. 12 days
6. The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in
A. 24 days
B. 36 days
C. 40 days
D. 12 days