Sometimes calculating something and coming up with an answer isn’t enough. It takes the answer represented in percentage to give more meaning to the answer.
Percentage is a number or ratio that represents a fraction of 100. Where the 100 represents the whole (original) value. For instance 67% means 67/100
Percentage is denoted by the % symbol or pct abbreviation.
Calculate Percentage
To calculate percentage of something, you need the value whose percentage you need, and the original value. Percentage is therefore;

For instance, if I have $100 and I spend $40, I’ll be left with $60. If we are asked to calculate the percentage of money spent, then $40 becomes our value of interest.

If from the same example, we were asked to calculate the percentage of money remaining, then our value of interest becomes the remaining $60. So;

NB: If you add the money spent and the money left, it adds up to the original $100. Also if you add up the percentage of money spent and the percentage of money left, you end up with the whole 100%.
Other circumstances might not be as straightforward as these but they will always resonate along the fraction of the interest value to the whole, then multiplied by 100. Always add % at the end of a percentage figure to make it clear.