Zakaat;mahr of Fatima RA;Fathers responsibility to support son

1. What is the max or min that can be paid to
a person who is entrusted to distribute zakat?
(Please reply in percentage of total sum.)

2. What was the mahr of Fatima ra?

a)In terms of silver

b)in terms of gold equivalent

c) in terms of rands equivalent

3) is it allowed to use medecine which
helps erection?

4) what is the responsibility of a father
once his son has attained manhood? In other
words how long is it waajib to support
him financially?
Wasalam