Simple Explanation
नई population \(150000 + 30000 = 180000\) है। Area 750 square kilometres unchanged है। इसलिए \(Population\ Density = \frac{180000}{750} = 240\) persons per square kilometre। तीसरा विकल्प सही है। In-migration population बढ़ाती है और fixed area में density भी बढ़ती है। परीक्षा में migration questions में पहले population update करें और फिर density calculate करें। / The new population is \(150000 + 30000 = 180000\). The area remains 750 square kilometres. Therefore, \(Population\ Density = \frac{180000}{750} = 240\) persons per square kilometre. The third option is correct. In-migration increases population and, within a fixed area, also raises density. In examinations, update the population first and then calculate density.
