Question 861050
Use a conversion factor.
There are 365 days in 1 year.
There are 24 hours in 1 day.
There are 60 minutes in 1 hour.
There are 60 seconds in 1 minute.
So, there are
{{{60}}}{{{sec/min}}}*{{{60}}}{{{min/hr}}}*{{{24}}}{{{hr/day}}}*{{{365}}}{{{day/year}}}
which equals
{{{31536000}}}{{{sec/year}}}
Since you have 15 years, multiply 15 by the conversion factor.
{{{15*31536000=473040000}}}{{{sec}}}