Marta had 1000 kg of tomatoes on Friday and sold 300 kg on Saturday, so she has 1000 – 300 = <<1000-300=700>>700 kg of tomatoes left.
On Sunday 200 kg of tomatoes had to be thrown away, so 700 – 200 = <<700-200=500>>500 kg of tomatoes were left.
The shipment on Monday was twice the size of the first one, so it was 2 * 1000 = <<2*1000=2000>>2000 kg of tomatoes.
The total amount of tomatoes ready for sale on Tuesday was 500 + 2000 = <<500+2000=2500>>2500 kg.
#### 2500