Answer:
Mia has 0.001 dollars after her donation.
Step-by-step explanation:
The maximum amount of money, Mia got from her mom is 20 dollars.
Money donated by Mia is 19.999 dollars.
So, the remaining amount of money: [tex]20-19.999=0.001[/tex] dollars
Hence, Mia has 0.001 dollars after her donation.