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The population of a town grew from 20,000 to 28,000. The continuous growth rate is 15%. The equation 20000e^0.15t=28000 represents the situation, where t is the number of years the population has been growing. About how many years has the population of the town been growing?
A. 2 years (its A)
B. 9 years
C. 17 years
D. 22 years