A dairy maker sells 250$ of milk to a cheese maker. The cheese maker users the milk to make $450

A dairy maker sells 250$ of milk to a cheese maker. The cheese maker users the milk to make $450 of cheese and sells it to a wholesaler. The wholesaler sells it to a retailer for $600. The retailer sells it for $1200. What is the GDP from this and how much value did each person add?

There should be 5 values for the answer. 1 GDP and 4 values added (1 for each person)