Well, I've copied the following from some site I can't find again:
"Staff salary profitability
Assuming a weekly increase of 2.75% per week, these are the break even points that I calculated, assuming you are trying to replace your current staff member with another:
(there was some rounding involved)
Assuming the new trainer has a $30,000 salary
Bonus of new trainer = $5 million, keep current trainer until salary = $173,200
Bonus of new trainer = $4 million, keep current trainer until salary = $155,000
Bonus of new trainer = $2.5 million, keep current trainer until salary = $125,000
Assuming the new trainer has a $20,000 salary
Bonus of new trainer = $5 million, keep current trainer until salary = $132,500
Bonus of new trainer = $4 million, keep current trainer until salary = $117,250
Bonus of new trainer = $2.5 million, keep current trainer until salary = $92,500
(HeadPaperPusher)"
So I was curious what this "Bonus of new trainer" was supposed to be.