A) \[60%\]
B) \[65%\]
C) \[70%\]
D) \[75%\]
Correct Answer: B
Solution :
Let initial amount be 100 gm.| disintegrated | Left | |
| \[100gm\,\xrightarrow{5\,days}\]\[\frac{100\times 10}{100}\] | 10 | 90 |
| \[90\,\xrightarrow{Next\,5days}\]\[\frac{90\times 10}{100}\] | 9 | 81 |
| \[81\xrightarrow{Next\,5\,days}\]\[\frac{81\times 10}{100}\] | 8.1 | \[\approx \,73\] |
| \[73\xrightarrow{Next\,5\,days}\]\[\frac{73\times 10}{100}\] | \[7.3\] | \[\approx \,65\] |
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