Apopulation of 200 animals is decreasing by 4% per year. at this rate, in how many years will the population be less than 170?

In the question , it is given that the population is decreasing by 4% per year .

So we have to use the following formula of exponential decay:

Substituting the given values, we will get

Dividing both sides by 200

Taking log on both sides

Dividing both sides by log(0.96)

t = approx 4 years

So after 4 years , the population will be less than 170.

this is answer of 144 cubic meters