Mark knows that the sales mix as a percentage of units sold is 20% for his hand-carved chess set and that it sells for $700. The sales mix as a percentage of units sold is 80% for his hand-carved backgammon set and it sells for $300. If Mark knows that his company- wide break-even point is 4,200 units, how many chess sets and how many backgammon sets does he need to sell to break even? O He must sell 3,360 chess sets and 840 backgammon sets in order to break even. He must sell 140 chess sets and 240 backgammon sets in order to break even. He must sell 840 chess sets and 3,360 backgammon sets in order to break even. He must sell 1,400 chess sets and 2.400 backgammon sets in order to break even