Red stamps are 50 cents each and for 30 stamps, Simon would get 50 * 30 = <<50*30=1500>>1500 cents
White stamps are 20 cents each and for 80 stamps, Peter would get 20 * 80 = <<20*80=1600>>1600 cents
The difference in cents is 1600 - 1500 = <<1600-1500=100>>100 cents
One dollar equals 100 cents, so the difference in dollars is 100/100 = $<<100/100=1>>1
#### 1