The nagar palika of certain city started campaign to kill the stray dogs which numbered 1250 in the city as a result, the population of stray dogs started decreasing at the rate of 20 % per month . Calculate the number of stray dogs in the city three months after the campaign started.

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Solution:

⇨Given
⇨p=1250
⇨r=20%
⇨n=3 months

⇨The number of stray dogs in the city three months after the campaign started Will be

        

 dogs

⇨Therefore  no. of stray dogs=640