So you want to work out the percentage increase or decrease from 81 to 66? Fear not, intrepid math seeker! Today, we will guide you through the calculation so you can figure out how to work out the increase or decrease in any numbers as a percentage. Onwards!
In a rush and just need to know the answer? The percentage decrease from 81 to 66 is -18.52%.
Percentage increase/decrease from 81 to 66?
An increase or decrease percentage of two numbers can be very useful. Let's say you are a shop that sold 81 t-shirts in January, and then sold 66 t-shirts in February. What is the percentage increase or decrease there? Knowing the answer allows you to compare and track numbers to look for trends or reasons for the change.
Working out a percentage increase or decrease between two numbers is pretty simple. The resulting number (the second input) is 66 and what we need to do first is subtract the old number, 81, from it:
66 - 81 = -15
Once we've done that we need to divide the result, -15, by the original number, 81. We do this because we need to compare the difference between the new number and the original:
We now have our answer in decimal format. How do we get this into percentage format? Multiply -0.18518518518519 by 100? Ding ding ding! We have a winner:
-0.18518518518519 x 100 = -18.52%
We're done! You just successfully calculated the percentage difference from 81 to 66. You can now go forth and use this method to work out and calculate the increase/decrease in percentage of any numbers.