case study problem# JobHunting - 待字闺中
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There are two options to send advertizing mails- first class (costs 50 cents
) and third class (costs 40 cents). First class has a delivery rate of 100%
but Third has 90%. what point are both the same?
) and third class (costs 40 cents). First class has a delivery rate of 100%
but Third has 90%. what point are both the same?