Decision Theroy, Theory of Computation

spam messages h= 98%, m= 90%, l= 80%
non spam h=12%, m = 8%, l= 5%
The organization estimates that 75% of all messages it receives are spam messages. If the cost of not blocking a spam mesage is $1, under what ranges of the cost of blocking a non-spam message is each security mode the optimal choice for a rational (risk neutral) information assurance manager?
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