Assuming that the average annual population growth rate is y%, we can get10× (1+y%) 20 ≤12, (1+y%)20≤ 1.2 according to the meaning of the question. According to the monotonic increase of logarithmic function, the logarithms on both sides of the inequality can be obtained.
Shanghai is the largest economic center and an important international financial center city in China, and it is one of the first coastal open cities. Shanghai is located in the east of China, at the mouth of the Yangtze River, facing the Pacific Ocean. By the end of 2020, the administrative division area of Shanghai was 6,340.5 square kilometers, covering 16 districts, and the permanent population of Shanghai was 24,870,900.