The population of the city in 2020 is 236,300.
Percentage can be described as a fraction out of an amount that is usually expressed as a number out of hundred.
The population of the city by 2015 : (1 + 0.07) x 230,000 = 246,100
The population of the city by 2020 : ( 1 = 0.04) x 246,100 = 236,300
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