Final answer:
The percentage of thymine should be 22%.
Step-by-step explanation:
According to Chargaff's rules, the amount of adenine (A) always equals the amount of thymine (T) in DNA. So, if the total percent of DNA in the base A is 22%, you should expect to find an equal amount of thymine (T) in the DNA sample. Therefore, the percentage of thymine would also be 22%.