How to determine interstage pressure for multi-stages centrifugal compressor?

How to determine interstage pressure for multi-stages centrifugal compressor ?

For a n-stages centrifugal compressor system with inlet and outlet pressure of P0 and Pn, the compression ratio ® should be about the same in each stage.

r = (Pn/P0)(1/n)

P1 = r.P0
P2 = r.P1
P3 = r.P2
.
.
.
Pn = r.Pn-1

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