The electricity costs of a business decreased from $12,000 one yeart to $10,920 the next. What is the rate of decrease?

the formula i am suppose to use i believe is
amount/ base= rate/100

is this way i should do it
12,000/10,920=r/100

I seem to get the amount and the base messed up

Actually it should be
(amount of change)/(base = rate/100
1080/12,000 = r/100
r = 9% (decrease)

thank you
with all the different formulas to solve problems are the book to help some one keep them straight cause i can not seem to any suggestions

Yes, keeping track of different formulas can be challenging sometimes. One suggestion to help you keep them straight is to create a reference guide or cheat sheet where you can write down the formulas and any important notes or tips. This can serve as a quick reference whenever you encounter similar problems.

Another helpful strategy is to practice solving various problems using different formulas regularly. With continued practice, you will become more familiar and comfortable with the formulas, making it easier to remember them.

Additionally, it can be beneficial to understand the logic and reasoning behind the formulas rather than memorizing them blindly. This way, even if you forget the exact formula, you can still work through the problem by understanding the concept and using logical reasoning.

Lastly, if you ever get stuck or confused, don't hesitate to refer back to your textbook or online resources for clarification. These resources usually provide explanations and examples that can help you understand and remember the formulas better.

Remember, practice, understanding the logic, and having a handy reference guide can all contribute to helping you keep the formulas straight.