Chip race question in MTT

[ptartaglio]

When there are an odd amount of chips for a chip race how do floor people determine how many higher denomination chips will go into play?

For example there is $325 of $25 chips does this floor give 3 chips or 4 $100 chips.

When there is $350 do they give 3 or 4?

When there is $375 do they give 3 or?

Thanks for your help,
Paul