<human>:  Tom plants 10 trees a year. Every year he also chops down 2 trees a year. He starts with 50 trees. After 10 years 30% of the trees die. How many trees does he have left?
<bot>: How many new trees does he get each year? ** He gets 10-2=<<10-2=8>>8 new trees a year
How many new trees does he have after 10 years? ** After 10 years he has 8*10=<<8*10=80>>80 new trees
How many trees does he have left? ** So he had 80+50=<<80+50=130>>130 trees
How many trees did he lose? ** He lost 130*.3=<<130*.3=39>>39 trees
How many trees does he have left? ** That means he had 130-39=<<130-39=91>>91 trees
#### 91