interim dividend

example
Geed Co paid an interim dividend of $0.06 per ordinary share on 31 OCT 20×6 and declared a final dividend of $0.08 on 31 DEC 20×6. the ordinary share in Geed Co are trading at a cum-div price of $1.83.

dividend yield = [(0.06+0.08)/(1.83-0.08)]

my question here is what if the interim dividend is paid under preference share but not ordinary share. do we still need to add into the calculation. or they add back into their own category