Percentage Calculator

Percentage Calculator application allows you to quickly calculate percentages. Using the menu, you can use the following functions:
  - Calculate the actual percentage of number
  - Calculate what percentage of the number A is the B
  - Add percent to a specific number
  - Subtract a percentage from a specific number (calculated rebate)
  - Check on the percentage increase or decrease a number
  - Calculate the number of, knowing that the number of A is X percent of the search numbers.

This application will be useful in different situations:
  - At school
  - Shopping
  - In restaurants (tips)
  - At work