8. As total sales dollars increase within a normal operating range a. The contribution margin will increase b. The contribution margin will decrease c. The contribution margin will stay the same 9. The Intemal Rate of Return is the a. Discount rate used in a DCF capital investment model that produces a zero present value for cash inflows b. Discount rate used in a DCF capital investment model that produces a zero present value for cash outflows c. Discount rate used in a DCF capital investment model that produces the present value of cash inflows to equal the present value of cash outflows d. Discount rate used in a payback method capital investment model that results in the fastest payback period e. None of the above 10. On the traditional / normal breakeven graph, the line with the steepest slope is the a. Fixed cost line b. Total cost line c. Revenue line