Answer:

Explanation:
When we talk about percentages, we refer to that amount, which, proportionally, refers to a part of the total. In this sense, the total amount of muffins would equal 100%. And we need to find what is the percentage of the amount of blueberry muffins, so:
Let:


Using cross-multiplication we can find the what percent of the muffins are blueberry:

Solving for

