Question

Blueberry bushes are planted in a field in the year 2009. The blueberry bushes start to grow and cover the field in such a way that the area covered by the bushes doubles every year. If they continue to grow in this way, the field will be entirely covered with blueberry bushes by the year 2016.

When will the field be covered 25% of the way

Answer 1

about halfway into 2011

Answer 2

Well, Let's see.
They are planted in 2009, and the field will be covered by 2016. 2016-2009= 7. They will be growing for 7 years.
If it's covered 1.5625% in the first year, 
Then 3.125% second year,
6.25% 3rd year,
12.5% 4th year,
25% 5th year,
50% 6th year,
100% 7th year.
So the 5th year? Maybe... I don't know. Please tell me if it's wrong!