Hardware buys cat litter for $$6$ less $20\%$ per bag. The store's overhead is $45\%$ of cost and the owner requires profit of $20\%$ of cost$.$For how much should the bags be sold?What is the amount of markup included in the selling price?What is the rate of markup based on selling price?What is the rate of markup based on cost$?$What is the break$-$even price?What operating profit or loss is made if a bag is sold for $$6?$