For a certain job, the cost of metal cutting is Rs. 180 C/V and the cost of tooling is Rs. 270 C/ (TV), where C is a constant, V is the cutting speed in m/min and T is the tool life in minutes. The Taylor's tool life equation is VT0.25 = 150. The cutting speed (in m/min) for the minimum total cost is________.

For a certain job, the cost of metal cutting is Rs. 180 C/V and the co

1.	For a certain job, the cost of metal cutting is Rs. 180 C/V and the cost of tooling is Rs. 270 C/ (TV), where C is a constant, V is the cutting speed in m/min and T is the tool life in minutes. The Taylor's tool life equation is VT0.25 = 150. The cutting speed (in m/min) for the minimum total cost is________.
A.	93.2
B.	93.9
C.	93.5
D.	93.3
Answer» B. 93.9

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