Final answer:
The annual worth of the investment is negative. The investment is not economically justified.
Step-by-step explanation:
The annual worth of the investment can be calculated using the net present value (NPV) method. NPV is the present value of cash inflows minus the present value of cash outflows.
In this case, the cash inflow consists of the annual savings from avoiding EPA fines, which is $18,500 per year. The cash outflow is the initial cost of the emission reduction filter, which is $75,000.
Using a discount rate of 10%, the NPV can be calculated as follows:
NPV = Cash inflow - Cash outflow = $18,500 - $75,000 = -$56,500
Since the NPV is negative, the annual worth of this investment is also negative. This means that the investment is not economically justified, as it would result in a loss for the company.