The population of a town in 1975 was 210,000 but grew to 280,000 in 1980. What was the the annual growth rate?

The population of a town in 1975 was 210,000 but grew to 280,000 in 1980. What was the the annual growth rate?

A 15.0%
B 6.7%
C 33.3%
D 26.7%

jamb 2001 geography

The correct answer is C. 33.3%

No explanation given

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