how to calculate BA & NA

e.g

192.169.1.0/27
255.255.255.224

1.Bil host/subnet 2^5=32

2.NA=Bil Host *(seg-1)
=32*(2-1)
= 32

3.BA=NA+(bil host-1)
=32+(32-1)
63

e.g
192.168.1.0/30 {111111 00}=30
8+8+8+6=30

1.Bil Host 2^2=4

2.NA= Bil Host*(seg-1)
=4*(28-1)
=108

3.BA=NA+(bil host-1)
=108+(4-1)
=111