what does the below rebus means?

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?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

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?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

You bought me for dinner but never eat me. What am I?

I am an odd number. Take away a letter and I become even. What number am I?