I always drive my customer away.

Who am I?

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

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

What jumps when it walks and sits when it stands?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

What does this rebus means ?

PROG WORKRESS

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?