Final answer:
The internal rate of return (IRR) for the machine is approximately 15.53%, which is higher than the firm's cost of capital of 14%. Therefore, investing in the machine would be considered profitable for the company.
Step-by-step explanation:
The internal rate of return (IRR) for the machine can be calculated by finding the discount rate at which the present value of cash inflows equals the initial cost of the machine. In this case, the cash inflows are the savings of $2,331 per year before taxes and depreciation for 10 years. The initial cost of the machine is $12,000.
Using a financial calculator or spreadsheet software, the IRR can be calculated to be approximately 15.53%. This means that the machine will generate an effective rate of return of 15.53%, which is higher than the firm's cost of capital of 14%. Therefore, investing in the machine would be considered profitable for the company.