The population of dolphins in the Pacific Ocean in 1990 was 243,000. It is decreasing every year by 2.3% due to pollution in our oceans. If this trend continues, how many dolphins will be there in 2030?
Year 1990, dolphins were 243,000 2.3% of 24300 = ( 2.3 / 100 ) * 243000 = ( 0.023 ) * 243000 = 5589 So every year, the population of dolphins decrease by 5589.
Now from 1990 to 2030 will be = 2030 - 1990 = 40 years
Therefore, for a year = 5589 decrease For forty years, it will be = 40 * (5589) = 223560 dolphins will be lost after forty years
The remaining ones = 243000 - 223560 = 19440 dolphins will be left
