During one year , the population of a town increased by 5% and during the next year , the population decreased by 5% . If the total population is 9975 at the end of the second year, then what was the population size in the beginning of the first year ?
population in the beginning of the first year
= `(9975)/((1 + 5/100) (1 - 5/100)) = (9975 xx 20/21 xx 20/19)` = 10000
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