We are asked to convert 2.5 years into hours.
Step 1:
There are 365 days in a year so 2.5 years will have
[tex]2.5\cdot365=912.5\text{ days}[/tex]Step 2:
There are 24 hours in a day so 912.5 days will have
[tex]912.5\cdot24=21900\text{ hours}[/tex]Therefore, 2.5 years will have 21900 hours.