Original price of a comic book : $2.95 discount 10% tax 5%

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

I'm confused on this could anyone me and show me what i need to do to solve it.