Question

The population of a town increases by 20 percent every year if the present population is 13800, find its population a year ago

Answer 1

Answer:

the population after 2 years be 622080

Step-by-step explanation:

$y=a(1+r){t}$

where a is the initial value, r is the rate of interest in the decimal form and t is the time in years

the population of a town increases by 20% every year.

if its present population is 432000

a=432000

20% is written in the decimal form.

=$\frac{20}{100}$

r=0.20

t=2 years

putting all values in the exponential function.

$y=432000(1+0.20)^{2}$

$y=432000(1.20)^{2}$

y= $432000 *1.44$

y=622080

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