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Thinking Complexity
This exercise will help you practice your bathtub thinking skills. It has two parts.
Hint: Don't forget that (1) a stock accumulates the net flow and (2) the slope of the stock curve is equal to the rate of the flow at the same point in time.
A suggested worked solution is provided in the references.
2016: Population + (Inflow - Outflow) = 1000 + (100-60) = 1040
2017: 1040 + (100-60) = 1080
2018: 1080 + (160 - 60) = 1180
2019: 1180 + (160 -60) = 1280