6. When using conventional cost-volume-profit analysis, some assumptions about costs and sales price are made. Which one of the following is not one of those assumption a. The costs can be expressed as straight lines in a break-even graph b. The actual variable cost per unit must vary over the production range c. The sales price will remain unchanged per unit d. Fixed cost will decrease per unit 7. The Flexible budget is includes all following, EXCEPT: a. Used to evaluate the cost performance and to compared the actual results and the budgeted one based on the same activity basis b. Prepared based on the planned output level usage at the beginning of a particular budget period Prepared for more than one level of activity - c. d. Defined as budget that is automatically tailored to any level of activity