would like to know how to go about doing this calculations for the following question thanks

customer has a heterogenous pool with the following config:

1000GiB of flash, 50 Gib free

5000Gib of SAS, 1000 Gib free

50000Gib of NL-SAS, 30000 Gib free

the customer creates a new lun with data placement policy set to "auto-tiering".  The LUN is then populated with 400Gib of data.  How is data distributed?