Justin invests $2000 at time 0. He receives $6443 at time 1 and pays $4500 at time 2. Compute the yield rate of his investment or the Internal Rate of Return, IRR.

Within the relevant range, if there is a change in the level of the cost driver, then a. total fixed costs will remain the same and total variable costs will change b. total fixed costs will change and total variable costs will remain the same c. total fixed costs and total variable costs will change d. total fixed costs and total variable costs will remain the same