One year, the population of a city was 110,000. Several years later it was 102,300. Find the percent decrease.
To find the percent decrease, we first need to determine the difference in population between the initial and final years: $110,000 - 102,300 = 7,700.$
Next, we divide the difference by the initial population and multiply by 100$\%$: $$\frac{7,700}{110,000} \times 100\% = \frac{7}{110} \times 100\% = \frac{7}{11} \times 10\% = \boxed{63.6\%}.$$