Percentages

• Finding a percentage of a number

  200 * 5%
  

• Adding/subtracting percentages from a base number

  100 + 10%
  200 - 20%
  

• Asking for the percentage of 60 that 20 represents

  20 is what % of 60
  

• Searching for the base value from which 25% equals 5

    5 is 25% of what
    

• Looking for the original amount before an increase of 25% was added to make it 5

  5 is 25% on what
  or in other forms:
  25% on what is 5
  what plus 25% is 5
  

• Looking for the original amount before a decrease of 25% was subtracted to make it 5

  5 is 25% off what
  or in other forms:
  what minus 25% is 5
  25% off what is 5
  

• Looking for the percentage increase or decrease

  44 is what % on 40
  24 is what % off 300
  

Autocompletion

You don't need to memorize these percentage expressions; generally, if I need any percentage-related expression, I type a % sign and invoke autocompletion with CTRL Space, which lists the operations.