"Well?" he finally ventured.
"What do you make of it?" Firmstone asked.
Luna turned to the assay sheet.
"The average of two hundred assays taken twice a week, twenty-five assays each time, gives twenty-five dollars a ton for the month of May." Luna read the summary.
Firmstone wrote the number on a slip of paper, then took the sheet from the foreman.
"You understand, then, that the ore taken from the mine and sent to the mill in May averaged twenty-five dollars a ton?"
"Yes, that's right." Luna was getting puzzled.
"Very good. You're doing well. Now look at this sheet." Firmstone handed him another paper. "Now read the summary."
Luna read aloud:
"Average loss in tailings, daily samples, May, two dollars and seventy-five cents a ton."