Final answer:
Demarcus' lifetime earnings when he retires at the age of 65 would be $5,297,936.
Step-by-step explanation:
To calculate Demarcus' lifetime earnings, we need to find the number of bi-weekly periods from the time he graduates until he retires at the age of 65. Assuming there are 52 weeks in a year, and that he graduates at 24 years old and retires at 65, the number of bi-weekly periods would be (65 - 24) * 26 = 2,156.
Now, we can calculate his lifetime earnings by multiplying the mean bi-weekly wage of $2,456 by the number of bi-weekly periods: $2,456 * 2,156 = $5,297,936.
Therefore, Demarcus' lifetime earnings when he retires at the age of 65 would be $5,297,936.