Earth Movers & Shakers Operates 3 Iron Ore Mines The Opportunity Cost of Moving One Miner from Scraping Bottom

Earth Movers & Shakers operates 3 iron ore mines. The accompanying table shows each mine's total daily production and the current number of miners at each mine. All miners work for the same wage, and each miner in any given mine produces the same number of tons per day as every other miner in that mine. $$\begin{array} { | l | r | r | } \hline & \text { Total Tans Per Day } & \text { Number of Miners } \\\hline \text { Mother Iuode } & 100 & 25 \\\hline \text { Bcrapirng Bottorn } & 30 & 10 \\\hline \text { Middle Drift } & 75 & 15 \\\hline\end{array}$$  
The opportunity cost of moving one miner from Scraping Bottom to another mine is:

A) 0 tons per day.
B) 3 tons per day.
C) 4 tons per day.
D) 5 tons per day.

Correct Answer:

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