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Percentage change - Calculation method Another common percentage reduction is the percentage change, which is often used in business and financial analysis. The percentage change expresses the change in the number as a percentage compared to the original value. To calculate the percentage change, you must subtract the new number from the old number, divide the result by the old number, and then multiply the result by one hundred. For example, if the company's turnover increases from 100,000 euros to 120,000 euros, the percentage change is ((120,000 – 100,000)/100,000) x 100 = 20%.nettilaskin The most common percentage calculation task encountered is to calculate a discount. Sometimes the calculations may have to be done quickly without a calculator, so one formula found to be quick and easy is to calculate the beginnings in the easiest way at first, i.e. with a 10% discount. For example, if there is a product in the store that costs €15.90, which has a 15% discount, and you would like to quickly calculate what its reduced price is roughly. With the method below, you can at least get close to the correct reading if you don't want to think too much. Taking the easiest way, you wonder how much 10% of the product is. In this case, it's €1.59, because you don't need a comma to move a notch to the left. Next, you should find out 5% of the original price. So 10% was €1.59, so then 5% is €0.8. Then you just add these numbers together and you get a discount of around €2.4, i.e. the reduced price is then around €13.50 So if you want to quickly calculate in your head, for example, a reduced price, I always recommend starting the calculation from 10%. Even if you don't get the exact result with this method, it's still close enough. Percentage calculator online You need percentage calculations in everyday life, almost every day. There are discount stickers on products on store shelves, loan interest rates change from time to time, there are voting percentages in parliamentary elections and taxes should be paid according to a certain percentage. Nordic Bank's interest calculator is a completely free and easy-to-use online interest calculator. The percentage calculator contains five different versions for the most important percentage calculation deliveries. With the percentage calculator, you calculate the percentage of the number you entered or how many percent a number is of the reference number you entered. The percentage calculator also calculates the total when a number is increased or decreased by a certain percentage and how much the change percentage is between the numbers entered into the calculator.