Answer: 
Step-by-step explanation:
The formula to find the final amount after getting simple interest :
 , where P is the principal amount , r is rate of interest ( in decimal )and t is time(years).
, where P is the principal amount , r is rate of interest ( in decimal )and t is time(years).
Given : Justin deposited $2,000 into an account 5 years ago. 
i.e. P = $2,000 and  t= 5 years
 He has just withdrawn $2,876. 
i.e. we assume that A = $2876
Now, Put all the values in the formula , we get

In percent, 
hence, He earned  of interest on account.
 of interest on account.