1) A store has been selling 200 Blu-Ray disc players a week at $350 each. A market survey indicates that for each $10 rebate offered to buyers, the number of units sold will increase by 20 per week. At what price should the store sell its Blu-Ray disc players to maximize its revenue? 2) A box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. Find the largest volume that such a box can have