During a certain week, a seal ate 50% of the first 80 smelt

During a certain week, a seal ate 50% of the first 80 smelt it came across, and 30% of the remaining smelt it came across. If the seal ate 40% of the smelt it came across during the entire week, how many smelt did it eat?

A. 32
B. 40
B. 55
D. 64
E. 80