Each tree produces 60*.5=<<60*.5=30>>30 more lemons than normal
So they each produce 60+30=<<60+30=90>>90 lemons
He has 50*30=<<50*30=1500>>1500 trees
So every year he produces 1500*90=<<1500*90=135000>>135000 lemons
That means he produces 135000*5=<<135000*5=675000>>675,000
#### 675000