The recreational players in the MTT see your raise as "chips", not as "blinds". In the early stages, when you raise, it is not about the fold
equity. You want to play with one or two players. If you play versus 4 players, you can't
bluff any more, your "one pair"
hands are not so good any more. In the late stages, your raise is much more "scary". You can play for fold equity already. Min raise is good enough for 400 blind. 20 blind-80 chips raise, 30 blind - 90 chips raise, 40 blind - 100 chips raise, 80 blind - 180 chips raise, 100 blind - 220 chips raise, 200 blind - 420 chips raise. I hope this is clear enough.
Also I hope my English is good enough
.