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  1. The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10,000, the present population is
    1. 4600
    2. 6400
    3. 7600
    4. 6000
Correct Option: B

Using Rule 17,
Present population

= 100001 -
20
2
100

= 10000 ×
4
×
4
= 6400
55


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