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Each year 80,000 people move into a city, 70,000 people move out, 18,000 are born, and 11,000 die. Write a balance on the population of the city.(a) 17,000 P/yr(b) 15,000 P/yr(c) 20,000 P/yr(d) 22,000 P/yr |
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Answer» The correct answer is (a) 17,000 P/yr Explanation: Let P denotes people, Input + Generation – Output – Consumption = accumulation 80,000 P/yr + 18,000 P/yr – 70,000 P/yr – 11,000 P/yr = A(P/yr) A = 17,000 P/yr Each year the city’s population increases by 17,000 P/yr. |
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