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24000 blood donors were registered with a charitable hospital. The number of donors increased at the rate of 5% every six month. Find the time period at the end of which the total number of blood donors becomes 27783.

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No of workers at the beginning= `6400`
Time=`4` years
Total number of workers during `4` years
`=>6400(1- 25/100)(1-25/100)(1+25/100)`
`=>6400**3/4**3/4**3/4`
`=>4500`
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