If the sequence of bases in DNA is ATTCGATG then the sequence of bases in its transcript will be
UAAGCUAC
DNA gets transcribed and forms mRNA. This mRNA transcript has bases complementary to DNA. Except for uracil which replaces thymine in mRNA. A (Adenine) pairs with U (Uracil) instead of Thymine (T) and C (Cytosine) pairs with G (Guanine). Thus, the complementary RNA sequence will be:
UAAGCUAC