this would be an exponential growth formula which uses the formula:
total = starting number x (1+ percent of change)^time
from the problem the starting number is 100 rabbits
percentage of change is 16% which = 0.16 as a decimal
time is number of years so 2018 - 2000 = 18 years
put those numbers into the formula to get:
total = 100 x (1+0.16)^18
total = 1,446 rabbits