Since we are not told how many rabbits there were to begin with, we can only work out the growth factor.
Let’s start with 1000 rabbits as an example. After a year there will be 2.7% of 1000 more rabbits=27 rabbits.
So after 1 year there will be 1027 rabbits. So the population has increased by a factor of 1027/1000=1.027.
The next year it will have grown by 1.027*1.027=1.054729 or about 1.0547 if we round up.
After 6 years it comes to 1.027⁶ which is 1.027 multiplied by itself 6 times=1.1733 approximately. That means an increase of 17.33%. So, if we started with 1000 rabbits we would have about 1173 rabbits after 6 years.