See how you go

First Question:
You are participating in a race. You overtake the second place person. What position are you in?
Second Question:
If you are in a race, and you overtake the last person, then you are?
Third Question:
Take 1000 and add 40 to it. Now add another 1000. Now add 30. Add another 1000. Now add 20. Now add another 1000. now add 10. What is the total? ( must be done in your head only!)
Fourth Question:
Mary's father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. What is the name of the fifth daughter?
Answer Q1: If you answered that you are first, then you are wrong! If you overtake the second place person, and you take their place, you are second!
Answer Q2: If you answered that you are second to last, then you are wrong again. Tell me, how can you overtake the LAST person?!
Answe Q3r: Did you get 5000? The correct answer is actually 4100. Don't believe it? Check with your calculator!
Answer Q4: Nunu? NO! Of course not. Her name is Mary. Read the question again!