Find the quotient simplify if possible x/3 , x/9

Yo y do yall have 2 stars that means yall wrong bro

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax