Answer:
The population increased by 34.69% over 20 years.
Step-by-step explanation:
It is given that the population of dolphins increases at a constant rate of 1.5% every year for 20 years.
Formula for population increase:
where, a is initial population, r is growth rate and t is time in years.
If the population of dolphins increases at a constant rate of 1.5% every year for 20 years, then the population after 20 years is
Where, a is the initial population.
The total percentage increase over the 20 years is
where, P is population after 20 years and a is initial amount.
Therefore the population increased by 34.69% over 20 years.