How to calculate percentage of marks obtained? Using this formula, you can answer questions like- what is 50% of 100 This formula can answer questions like – what would be 100% if 50 is 25%. Using this formula you can answer questions like- what percentage of 100 is 20. You can write the percentage formula in three ways: The first value being V1 and the second value being V2 The percentage formula can be written in different forms, but it is an algebraic equation involving three values. There are many uses of percentages, it is used in school to calculate marks, in offices and most people present their data in terms of percentage. A percentage is said to be a ratio which has been expressed as a fraction of 100. In a small town, the population increased from 25,000 people in 1990 to 32,000 people in 2000.In order to know how to calculate percentage, we must first know what a percentage is. What is the percent decrease in oil prices? ANSWER BOX: % The price of oil decreased from $54 per barrel to $50 per barrel. What is the percent increase in tuition? ANSWER BOX: % The tuition at a college increased from 50,000 in 2006 to to 59,000 in 2007. What is the percent decrease in stock price? ANSWER BOX: % Stock in Company XYZ decreased from $14 a share to $9 a share. What is the percent increase in enrollment? ANSWER BOX: % 1.Īt Furnace Woods School, enrollment increased from 320 students in 2006 to 349 students in 2007. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. For each exercise below, click once in the ANSWER BOX, type in your answer and then click ENTER. Round your answer to the nearest tenth of a percent when necessary. Enter your answer for each exercise without the percent symbol. The formula for finding percent change is:ĭirections: Each problem below involves percent change. Percent change is useful to help people understand changes in a value over time. Summary: Percent increase and percent decrease are measures of percent change, which is the extent to which something gains or loses value. What is the percent decrease in length?Īnswer: There was a 33.3% decrease in length. What is the percent increase in the cost of the item?Īnswer: There was an 8% increase in the cost of the item.Įxample 4: Four feet are cut from a 12-foot board. The formula is shown below.Įxample 3: At a supermarket, a certain item has increased from 75 cents per pound to 81 cents per pound. Convert the resulting decimal to a percent. Another way to remember the procedure is to subtract the old value from the new value and then divide by the old value. Remember that the procedure above asked us to divide by the original value. In Example 2, we divided by 40, which was the higher number. In Example 1, we divided by 10, which was the lower number. Let's look at some more examples of percent increase and decrease. Percent changes are useful to help people understand changes in a value over time. Percent increase and percent decrease are measures of percent change, which is the extent to which something gains or loses value. The resulting decimal is then converted to a percent.Īnswer: There was a 27.5% decrease in staff. What is the percent decrease in staff?Īnalysis: When finding the percent decrease, we take the absolute value of the difference and divide it by the original value. Let's look at an example of percent decrease.Įxample 2: The staff at a company went from 40 to 29 employees. The resulting decimal is then converted to a percent.Īnswer: The percent increase in Ann's pay is 20%. If her pay is increased to $12.00, then what is her percent increase in pay?Īnalysis: When finding the percent increase, we take the absolute value of the difference and divide it by the original value. Learn About Calculating Percent Increase And Decrease With The Following Examples And Interactive Exercises.Įxample 1: Ann works in a supermarket for $10.00 per hour.
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