If there are 1800 births, 1800 deaths, 600 in-migrants and 250 out-migrants, what will the total change be?

Correct answer: Increase of 350

Answer: A, an increase of 350. Solve the two parts separately to avoid mixing additions and subtractions. First calculate natural change: births minus deaths = 1,800 − 1,800 = 0. Thus births and deaths balance each other. Next calculate net migration: in-migration minus out-migration = 600 − 250 = +350. Finally add the two components: total change = natural change + net migration = 0 + 350 = +350. Therefore the population increases by 350 people. Option A is correct. Option B ignores the positive net migration. Option C gives the wrong direction; the larger number is in-migration, so migration adds people rather than removing them. Option D incorrectly adds births and deaths instead of subtracting deaths and also ignores the migration balance. A useful checking method is to ask: equal births and deaths cancel, then 600 arrivals minus 250 departures leaves 350 arrivals.