Table: Demand Schedule of Gadgets

$\backslash$table$[[\backslash$table$[[$Price of$],[$a Gadget$]],\backslash$table$[[$Quantity of$],[$Gadgets Demanded$]]],[$$$10,0],[9,100],[8,200],[7,300],[6,400],[5,500],[4,600],[3,700],[2,800],[1,900],[0,1,000]]$

$($Ref $30-1$ Table: Demand Schedule of Gadgets$)$ Use Table $30-1$: Demand Schedule of Gadgets. The market for gadgets consists of two producers, Margaret and Ray. Each firm can produce gadgets at a marginal cost of $$2$ and nofixed cost. Suppose that these two producers have formed a cartel, agreed to split production of output evenly, and are maximizing total industry profits. If Margaret decides to cheat on the agreement and sell $100$ more gadgets, Margaret's price effect will be a$($n$)$ in profit of

decrease; $$400$

increase; $$400$

increase; $$200$