Question

The bird population on an island is declining at a rate of 4% per year. The population was 2700 in the year 2015.

Which answer is the best prediction of the population in the year 2020? Use the formula b(1−r)t


A. 1847


B. 2035


C. 2202


D. 3285

Answer 1

P = b(1 - r)^t; where, b = 2700, r = 4% = 0.04, t = 2020 - 2015 = 5 years.

P = 2700(1 - 0.04)^5 = 2700(0.96)^5 = 2700(0.8154) = 2202