plz solve all

Illustration: Original cell phone sales and cost data for Vargo Electronics is as shown. Unit selling price $500 Unit variable cost $300 Total fixed costs $200,000 Break-even sales $500,000 or 1,000 units Case I: A competitor is offering a 10% discount on the selling price of its cell phones. What effect will a 10% discount on selling price ($500 x 10% = $50) have on the breakeven point? Case II: Management invests in new equipment that will lower the amount of direct labor required to make cell phones. They estimate that total fixed costs will increase 30% and variable cost per unit will decrease 30%. What effect will the new equipment have on the sales volume required to break even? Case III: Vargo's principal supplier of raw materials has just announced a price increase. The higher cost is expected to increase the variable cost of cell phones by $25 per unit. Management plans a cost-cutting program that will save $17,500 in fixed costs per month. Vargo is currently realizing monthly net income of $80,000 on sales of 1,400 cell phones. What increase in units sold will be needed to maintain the same level of net income? Variable cost per unit increases to Fixed costs are reduced to Contribution margin per unit becomes