Solution
For this case we can model the number of fishes with the following equation:
[tex]A=19000(1-0.08t)[/tex]And for this case we want to find the value for t =12 and replacing we got:
[tex]A=190000\cdot(1-0.08\cdot12)=7600[/tex]And then the number of fishes after 12 years would be 7600
so then they catched 182400