Investments of Unequal Lives

There are times when application of the NPV rule can lead to the wrong decision. Consider a factory that must have an air cleaner that is mandated by law. There are two choices:

The "Cadillac cleaner" costs $$4,000$ today, has annual operating costs of $$100,$ and lasts $10$ years.

The "Cheapskate cleaner" costs $$1,000$ today, has annual operating costs of $$500,$ and lasts $5$ years.

Assuming a $10\%$ discount rate, which one should we choose?How would i use npv to calculate