Answer: 21,896
Explanation: To find how many pigeons there will be in 13 years, we must recall the formula to find the percentage:
Percentage = whole amount * part percent / 100
So, let's plug in the numbers to the formula:
Percentage = 9520 * 10 / 1000
9520 * 10 = 95200
95200 / 100 = 952
So, every year, there are 952 pigeons added to the 9,520 pigeons.
Now, we must multiply the 952 by 13 (13 years)
We should get 12376
Now, finally, we add 12376 to 9520 to get 21896.