What percentage of the fescue seed is classified as weed seed, given that the total impurity includes 2% weed seed?

The correct answer is based on the understanding of seed purity and the classification of different components within seed mixtures. In this case, if the total impurity of the fescue seed is indicated to be 2%, and it is specifically stated that this includes 2% weed seed, then it follows that the percentage of weed seed in the fescue seed is directly represented by this figure.

Impurity refers to any unwanted materials within a seed lot, including weed seeds, inert matter, and other contaminants. Since it has been clearly identified that all of the noted impurity—2%—is attributed to weed seeds, it is logical to deduce that the percentage of weed seed classified in the fescue mix is indeed 2%. Other options reflecting lower percentages do not account for the complete 2% stated, and higher percentages misrepresent the classification of the total impurity as only consisting of weed seeds without including any other impurities. Hence, the recognition that the total impurity is entirely composed of weed seed leads to the conclusion that 2% is the correct answer.