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A bottle is filled 10% in one hour and 8% of the water is emptied in the next one hour. If this process is repeated once again, find the percentage of the bottle filled with water.

A
5.67%
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B
11.48%
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C
17.66%
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D
20.51%
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Solution

The correct option is C 17.66%
The bottle will be filled 10% in the first hour. In the next hour, 8% of it. i.e. 10 ×(8100)=0.8% of the bottle is emptied. The remaining water after the second hour is 9.2%. Again, in the third hour 10% bottle is filled, it becomes 19.2%. Now, Again 8% of it. i.e 19.2 ×(8100)=1.536% is emptied in the fourth hour so the remaining water is 19.21.536=17.66%

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