The present population of a country estimated to be 10 crores is expected to increase to 13.31 crores during the
next three years . The uniform rate of growth is
10 crores x` (1 - R/100)^3` = 13.31 crores
`:.` ` (1 + R/100)^3 = (13.31 crores)/(10 crores) = 13.31/10 = 1331/1000 = (11/10)^3`
So , `(1 + R/100) = 11/10 hArr (1 + R/100) = (1 + 1/10) hArr R/100 = 1/10 hArr ` R = 10
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