please show work so I can learn

Kai sells a small magazine full of celebrity gossip to college students for $2.75 per copy. Hiring the printing press for one day, the only fixed cost, is $317 per issue. The variable cost of printing each issue is $0.81 per copy. The printer tells Kai the cost of hiring the press is to increase by $126 per day. Kai decides to add color and keep his price the same. This will increase variable costs by $0.40 per issue. What will be the new unit volume (copies per issue) required to maintain $500 profits and cover the increased fixed and variable costs? TUTORIAL 0 units CALCULATED VARIABLES: PS3 2 3 6 SUBMIT ANSWER EXIT volume = 421