3 A company producing salt from sea water changed to a new process. The amount of salt obtained each week increased by \(2 \%\) of the amount obtained in the preceding week. It is given that in the first week after the change the company obtained 8000 kg of salt.
- Find the amount of salt obtained in the 12th week after the change.
- Find the total amount of salt obtained in the first 12 weeks after the change.