A man gave $$\frac{1}{4}th$$ part of his property to his daughter $$\frac{1}{2}$$ part to his son and then donated $$\frac{1}{5}th$$ part. Thus how much portion of his property did he give away ?

A

$$ \frac {1}{20} $$

B

$$ \frac {19}{20} $$

C

$$ \frac {1}{10} $$

D

$$ \frac {9}{10} $$