I am trying to create a formula to calculate rental return if a property
manager is involved and charges a % of the rent.

(48 Weeks)
R21 S21 T21
U21
Rent Property Manager Y/N Property Managers%
Rent per year

100 y 10%
4,800.00

I have the following formula at this stage.

=IF(AND(S21="y",R21<"",T21<""),R21*T21*48,IF(OR( R21="N",),"",R21*48))

But as you can see the 'N' part of the forumula works fine, but I cannot
understand how to complete the following equation 100-10%x48 (which =
4,320.00) to replace ,R21*T21*48,

Any suggestions?

Cheers Scott