Answer: 80.19%.
Step-by-step explanation: To find the percentage of birds that were treated, we need to divide the number of birds that were treated (85) by the total number of birds (106) and then multiply by 100.
Dividing 85 by 106 gives us 0.8019 (rounded to four decimal places).
To convert this to a percentage, we multiply by 100. So, 0.8019 multiplied by 100 is 80.19.
Therefore, approximately 80.19% of the birds were treated.
Remember, to find the percentage of a number, we divide the part (number of birds treated) by the whole (total number of birds) and then multiply by 100. In this case, 85 divided by 106 is 0.8019, and multiplying by 100 gives us approximately 80.19%.