Concept:The percentage of birds that did not lay eggs is found by comparing the non-laying birds with the total number of birds.Explanation:Total number of birds =2,000Number of eggs laid per day =1,680Assuming each laying bird lays one egg per day, the number of birds that did not lay eggs is:2,000−1,680=320Now calculate the percentage:Percentage=(2,000320)×100=16%Answer:A. 16%