When A plant species has its DNA analyzed. The results show that 28 % of its nitrogen bases are guanine. What is the percent represented by thymine

In DNA adenine (A) pairs with thymine (T) & cytosine (C) with guanine (G), so if 28% is guanine, then there is also 28% of C, totaling 56%. This leaves 44% which must be split evenly between A and T, so there is 22% thymine (as well as 22% adenine)