How do you get 1.04 to the 12th power

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?

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