Can you find out which options fits best with the missing column?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

When it is alive we sing, when it is dead we clap our hands. What is it?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you count the number of matches in the picture below ?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?