what does the below rebus means?

I have Rs.50 and I spend it in the way as below.

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

'Ferrari driver' easily beats the 'force driver' in a two-car race. How did Indian newspapers truthfully report so to look as a 'force drive' had outdone the 'Ferrari driver'? Think!!!

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?