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When someone pays or receives simple interest (I), he or she pays or receives interest on the principal only, not on the interest that has already been paid. To find the interest you can use the following formula. Simple interest formula Interest = Principal × Interest rate × Time = Prt To find the simple…

To calculate sales tax of an item, simply multiply the cost of the item by the tax rate. Exercises # 1: You buy a car for 20,000 dollars and pay 5% in tax. How much is tax? Tax = 20,000 times 5% = 20,000 times 0.05 Tax = 20,000 times 0.05 = 1,000 dollars. The…

The greatest possible error calculator below will find the error for you no matter how big the number you enter is. Enter a number followed by the unit. However, leave a space between the number and the unit. This calculator will help you master the concept.https://math.basic-mathematics.com/greatest-possible-error-calculator/greatest-possible-error-form.php                  …

Just like the name suggests, the percent of decrease is the amount of decrease out of one hundred. Once we know what the decrease is, just divide the decrease by the original amount and express the answer as a percent. The formula along with a nice example are shown in the figure below. The amount…

Just like the name suggests, the percent of increase is the amount of increase out of one hundred. The amount of increase is the final amount minus the original amount. For example, if you are looking for the percent of increase from 4 to 6, the original amount is 4 and the final amount is…

How to convert a number from decimal to percent is the goal of this lesson. In a nutshell, all you need to do is to move the decimal point two places to the right and adding the percent symbol. Did you not clearly understand the example in the figure above? Are the steps still confusing?…

This lesson will show you how to convert percent to decimal. Converting percent to decimal should not be hard if you carefully study this lesson Recall that percent means per hundred. For instance, 25% means 25 per hundred. You can write 27% as 0.27 or   27100 To change a percent into a decimal, simply move…

The formula for percentage is the following and it should be easy to use if you follow the straightforward directions given. Study the formula below carefully before looking at the examples. 22Save We will take some examples to illustrate. Let us start with the formula on the left. An important thing to remember is to…

Finding a percentage by expressing the rate as a decimal and multiplying it by the base is the goal of this lesson. From the example in the image below, we have three important terms to define when finding a percentage. Rate: The rate is the percent Percentage: The result obtained when a number is multiplied by a…

The meaning of percent and how to read percent is the goal of this lesson. The lesson is concise and right to the point. The figure below has 100 squares. There are 16 blue squares in the figure. Since there are 16 blue squares out one hundred squares we say 16% of the figure have…