You are long $10$ gold futures contracts, established at an initial settle price of $$1,600$ per ounce, where

each contract represents $100$ ounces. Over the subsequent four trading days, gold settles at $$1,606,$

$$1,597,$ $$1,606,$ and $$1,608,$ respectively.

$($a$)$ Calculate the profit or loss for each trading day.

$($b$)$ Compute your total profit or loss at the end of the trading period.