In the promise-kept position, the mill would have begun making a profit after a timely delivery. As a result of the breach and proper mitigation, the loss is six days' profit.
Next, we figure out the difference in value between the promise-kept position and the result-of-the-breach-proper-mitigation position. Because mitigation was not possible, the result is simply the six days' lost profit. We award this amount. The following screen illustrates this outcome.