The garbage truck passes through Daniel's neighborhood for 3 days.
In the first week, 200 * 3 = <<200*3=600>>600 kilograms of garbage are accumulated.
In the second week, half the amount of garbage is accumulated, which is 600 / 2 =<<600/2=300>>300 kg of garbage.
During the 2 weeks, 600 + 300 = <<600+300=900>>900 kg of garbage are accumulated.
#### 900