Industrial Engineering and Production Management
Break-even point is the point where

Fixed and total cost lines intersect
Variable and total cost lines intersect
Sales revenue and total expensive lines intersect
Fixed and variable cost lines intersect

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Industrial Engineering and Production Management
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

Complete details of items in, waiting line are known
The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known
Arrival and waiting times are known and can be grouped to form a waiting line model
All variables and constants are known and form a linear equation

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