Pls help me thank you so much

Einstein office equipment has a rental plan for office machines. a fax machine that lists for $722.98 can be rented for 22% of the price annually. the state imposes a usage charge of 3.2%. if stephen hawking travel decides to rent the fax machine, what will its total monthly rental charge be?

Mrs. piazza invested 8000 in a certificate of deposit that pays 3% simple interest for 4 years. how much will be in mrs. piazza's account at the end of 4 years

Ineed with area of a circle a circular plate has a diameter of 6 inches. what is the exact area of the plate? a.3_ square inches b.6_ square inches c.36_ square inches d.9_ square inches