We have to apply the next formula:
A= P(1+r)^t
Where:
P= original population (284)
r = growing rate (in decmal form) (4/100=0.04)
t= years passed (2020-2013= 7)
A= number of students after t years
Replacing:
A = 284 (1+0.04)^7
A= 284(1.04)^7
A= 373 students