The figure below shows a graph which qualitatively relates

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The figure below shows a graph which qualitatively relates cutting speed and cost per piece produced.

The three curves 1,2 and 3 respectively represent

1. machining cost, non-productive cost, tool changing cost
2. non-productive cost, machining cost, tool changing cost
3. tool changing cost, machining cost, nonproductive cost
4. tool changing cost, non-productive. cost, machining cost

Correct Option: A

Machining cost = [Machining time × Direct Labour Cost]
So as cutting speed increases, machining time decreases and therefore machining cost decreases.