Final answer:
Without specifics on the selling price and quantity of hamburger buns per tray, it's not possible to estimate the net sale of one tray of hamburger buns.
Step-by-step explanation:
The estimated net sale of one tray of hamburger buns cannot be directly calculated from the information provided. The data does not specify the cost or number of hamburger buns per tray. To estimate the net sale, one would need the selling price per bun or per tray and the number of trays sold. Without this specific information, the net sales figure remains indeterminate.