Proportion equations says that the ratio of part to the whole is equal to the ratio of percentage to one hundred. Remove the sign from the 20 and drop a period in front of the 20 so we have20 we are allowed to do this because when we are finding percents we are really multiplying a decimal number against another number because 20 percent of a number can be written as a ratio of a part per hundred. This calculator solves four types of percentage problems.
This unit introduces algebra by examining similar models.
Percent equation says that the product of the percentage in the decimal form and the whole gives you the quantity of the part. When the numbers in a percent problem become a little more difficult the tricks no longer work so you want to know how to solve all percent problems. Proportion equations says that the ratio of part to the whole is equal to the ratio of percentage to one hundred. You can think of the most basic as XY P x 100.