As you have phrased it, the question can be understood in two ways.
- The population size at t+1 is 350, after births, deaths and migration have taken place.
- The population size is 350 after deaths, but you also have to take births and migration into account to calculate population size at t+1
For alternative 1 the growth rate is:
pgr=(230+21)−(488+13)600=−0.417,
with ΔN=−250⇒−250=230+21−deaths−13
For alternative 2 the growth rate is:
pgr=(230+21)−(250+13)600=−0.02
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