Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I always drive my customer away.

Who am I?

What is the largest number you can write with just 3 digits?

Six people park their car in an underground parking of a store. The store has six floors in all. Each one of them goes to a different floor. Simon stays in the lift for the longest. Sia gets out before Peter but after Tracy. The first one to get out is Harold. Debra leaves after Tracy who gets out on the third floor.

Can you find out who leaves the lift on which floor?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What begins with T, ends with T, and has T in it?

How can you leave a room with two legs and return with six legs?

Find the 8 in the below-given Image.

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

Rearrange the letters in "new door" to make one word.