Plz answer its timed

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

100 points, hi, i’m not sure how to get the equation from the graph and table.

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?