Jim has 2 rows of 4 trees to start.  When he turns 10 he decides to plant a new row of trees every year on his birthday.  On his 15th birthday after he doubles the number of trees he has.  How many trees does he have?
He started with 2*4=<<2*4=8>>8 trees
He plants trees for 15-10=<<15-10=5>>5 years
So he planted 5*4=<<5*4=20>>20 trees
So he had 20+8=<<20+8=28>>28 trees
After doubling them he had 28*2=<<28*2=56>>56 trees
#### 56