How do you work out 40% of 80?

Word Percent is originated from a Latin word. 

Per cent means out of every hundred. (  /100)

we know that, a percent can be written as a fraction and a decimal. 

For solving this kind of problems. Lets see some steps: 

Step 1: Change percentage into fraction 

Step 2: Replace "of" with multiplication symbol (x)

Step 3: Multiply numerator with a whole number 

Step 4: Divide a number that is a numerator by a number that is in the denominator