Calculation Field not working with hidden fields

Replies: 0

Example:
Calculation Field(T1) is F1+F2+F3

Details:
F2 only shown on form when C1 is Yes
F2 is G1*50

So if C1 is No then F2 is not shown, T1 shows 50
So if C1 is Yes then F2 is shown, T1 shows 0