Wheeler Corporation's most recent income statement follows: Prepare a new contribution format income statement under each of the following conditions (consider each case independently): The sales volume increases by 40 units. (Input all amounts as positive values except losses which should be indicated by a minus sign. Omit the "$" sign in your response.) The sales volume declines by 40 units. (Input all amounts as positive values except losses which should be indicated by a minus sign. Omit the "$" sign in your response.) The sales volume declines by 40 units. (Input all amounts as positive values except losses which should be indicated by a minus sign. Omit the "$" sign in your response.) The sales volume is 7.600 units. (Input all amounts as positive values except losses which should be indicated by a minus sign. Omit the "$" sign in your response.)