Question: The population of an area starts at 100,000 people. It increases by 60% over 10 years due to birth. In that same time, 2000 people leave per year from emigration and 2500 people come in per year from immigration. How many people are in the area at the end of 10 years? Think carefully first, then make a decision:
The population increased by 100000 * .6 = 60,000 from births. They lost 2000 * 10 = 20,000 people from emigration. They gained 2500 * 10 = 25,000 people from immigration. That means the net increase from people moving was 25000 - 20000 = 5,000. So the total population is 100,000 + 60,000 + 5,000 = 165,000. So the answer is 165000.