The table below shows the percentages of bases in a DNA sample. How much Guanine (G) should you expect to find in the sample?
It seems like the actual percentages of each of the bases (Adenine, Thymine, Cytosine, and Guanine) in the DNA sample have not been provided in your message. In DNA, the amount of Guanine (G) is equal to the amount of Cytosine (C) due to base pairing rules—G pairs with C, and Adenine (A) pairs with Thymine (T).
If you can provide the percentage of any of the other bases, particularly Cytosine (since it pairs with Guanine), or the percentage of Guanine itself, I could directly tell you the percentage of Guanine in the DNA sample. Otherwise, if you only have the percentages of Adenine and Thymine, we can infer the percentage of Guanine by subtracting the combined percentage of Adenine and Thymine from 100% (assuming that you have a double-stranded DNA sample where the entire set of base pair rules applies).
To provide a proper answer, please give me the percentages of at least one of the other bases in the sample.