Round 729 to the nearest 100

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?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

W-16=-12 solve each one step equation plz