If we consider the effect of taxes, then the degree of operating leverage can be written as:

DOL = 1 + [FC (1 T_C) T_C D]/OCF

Consider a project to supply Detroit with 27,000 tons of machine screws annually for automobile production. You will need an initial $4,600,000 investment in threading equipment to get the project started; the project will last for 5 years. The accounting department estimates that annual fixed costs will be $1,100,000 and that variable costs should be $205 per ton; accounting will depreciate the initial fixed asset investment straight-line to zero over the 5-year project life. It also estimates a salvage value of $475,000 after dismantling costs. The marketing department estimates that the automakers will let the contract at a selling price of $308 per ton. The engineering department estimates you will need an initial net working capital investment of $440,000. You require a return of 12 percent and face a tax rate of 23.

a.	What is the percentage change in OCF if the units sold changes to 28,000? (Do not round intermediate calculations and enter your answer as a percent rounded to 4 decimal places, e.g., 32.1616.)
b.	What is the DOL at the base-case level of output? (Do not round intermediate calculations and round your answer to 4 decimal places, e.g., 32.1616.)