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The population of a town in the 1989 was shown as 60 000 people with male to female ratio of 2 : 3. Another census had been taken 1979 and another one is due 1999. Statistics shows that the growth rate of the town population is 20% of the population at the preceding census. Determine
a)the population of the town in 1979
b)the expected population in 1999
c)the expected number of males and females in the 1999 census.