The standard time at lensco inc for grinding a set of, Operation Management

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The standard time at lensco inc for grinding a set of

The standard time at Lensco Inc for grinding a set of prescription lenses is 18 minutes. If the typical efficiency for their operations is 80%, and typical machine reliability is 87% how many machines are required to meet the forecast of 17,247 lens sets for 2007? (They currently work 7.2 hour/shift, 6 shifts per week, 50 weeks per year)

S = 18
E= 80%
R= 87%
Forecast of 17,247
F = S Q / E H R

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