Derby Phones is considering the introduction of a new model of headphones with the following price and cost characteristics: $ 16 per Sales price Variable costs unit 7 per unit Fixed costs 21,000 per month Assume that the projected number of units sold for the month is 7,000. Consider requirements (b), (c), and (d) independently of each other. Required: a. What will the operating profit be? Operating profit b. What is the impact on operating profit if the sales price decreases by 10 percent? Increases by 20 percent? (Do not round intermediate calculations.) by Sales price decreases by Operating 10 percent: profit Sales price increases by 20 Operating percent: profit by c. What is the impact on operating profit if variable costs per unit decrease by 10 percent? Increase by 20 percent? (Do not round intermediate calculations.) by Variable costs per unit decrease Operating by 10 percent: Variable costs per unit increase by Operating 20 percent: profit profit by d. Suppose that fixed costs for the year are 10 percent lower than projected, and variable costs per unit are 10 percent higher than projected. What impact will these cost changes have on operating profit for the year? Will profit go up? Down? By how much? (Do not round intermediate calculations.) Operating profit by