New filtration system for commercial airliners are available that use electric field to remove up to 99.9% of infectious diseases and pollutant from aircraft air.
This is vitally important, as many of the flu germs, viruses, and other contagious diseases are transmitted through the systems that recirculate aircraft air many times per hour.
Investment in the new filtration equipment can cost from 10000 to 15000 per aircraft, but saving in fuel, customer complaints, legal actions, etc., can also be sizable.
Use the estimates below (in 100 units) from two suppliers provided to an international carrier to do the following, using a spreadsheet and an MARR of 15% per years.
PW versus i values for both alternatives cash flows and PW versus
the cash flow sign tests for each filter indicate no multiple rates.
The incremental cash flow sign test does not indicate the presence of a unique positive root; however, the second rate is an extremely large and useless value.