Perfective maintenance usually is cost effective the system

During the middle of

Explanation:

Perfective maintenance usually is cost effective during the middle of the system.

Perfective maintenance usually is cost effective during the middle of the system.

if you have a hp laptop on the top row of your keyboard there sould be a button that says prt sc , click that then wait a second then open the paint app open the clipboard and hit paste then save as a file. hope that ^-^