What goes up but never comes down?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

A Miser man decided to go on a vacation for a month. He goes to the bank and asks for a trip loan of $500. The bank officer asks the man that the loan can only be approved when he mortgage some valuable thing at the bank. Miser man mortgages his only car whose worth was a whopping $80000. The Bank officer laughed at him and approve the loan instantly. After vacation when the miser man returns, the bank officer asked him "Are you an idiot, why is your mortgage such an expensive car for such a short loan?".

Miser man replied with some reason and the bank officer agreed that the miser man is actually not an idiot.

What did miser man reply to the bank loan officer?.

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?