What does this rebus riddle means ?

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

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

What do you think with the below Picture ?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

I am white when I am dirty, and black when I am clean. What am I?

In which direction should the missing arrow point?