<human>:  Leo collects stickers. Two years ago, he had 100 stickers in his collection. Last year, Leo collected 50 stickers. This year, he collected twice the number of stickers as the previous year. How many stickers does Leo have in his collection?
<bot>: How many stickers did Leo have last year? ** Last year, Leo had 100 +50 = <<100+50=150>>150.
How many stickers did Leo collect this year? ** This year, he collected 2 x 50 = <<2*50=100>>100.
How many stickers does Leo have in his collection? ** Therefore, Leo had 150 + 100 = <<150+100=250>>250 stickers in his collection.
#### 250