Exercise 5-1 Preparing a Contribution Format Income Statement (LO1) Wheeler Corporations most recent income statement follows: Required: Prepare a new contribution format income statement under each of the following conditions (consider each case independently): 1. The sales volume increases by 80 units. (Input all amounts as positive values except losses which should be indicated by a minus sign. Omit the $ sign in your response.) 2. The sales volume declines by 80 units. (input all amounts as positive values except losses which should be indicated by a minus sign. Omit the $ sign in your response.) 3. The sales volume is 6.100 units. (input all amounts as positive values except losses which should be indicated by a minus sign. Omit the $ sign in your response.)