Please help! If you do so you will get 50 points and brainiest!

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?