![]() Two years ago, a football ticket was $20. The $30 price is discounted by $6 for a total of $24. Multiply the decimal by the original price to get the discount amount. Calculating the sale priceįind the sale price if a 20% discount is allowed off the marked price of $30.Ĭonvert the percentage to a decimal. Related: How To Calculate Percentage Decrease (With Examples) 2. You can double-check your answer by dividing $400 by 100. $ 120 x 100 = $12,000ĭivide the result of the multiplication by the percentage. What was the original price?įind the percentage of the original or real number. The price of a laptop was reduced by 30% to $120. Here are a few examples of finding the percentage in certain situations: 1. Related: What Does a Finance Manager Do? Percentage calculation examples Multiply the percentage by the total valueĭivide the value 2 by the total 5 and multiply by 100ĭivide the ending number 2 by the percentage 45% All three can be solved by calculating for the missing part of the percentage formula: Percentage = (Value / Total value) × 100 These include finding the ending number, finding the percentage and finding the starting number. There are three common types of percentage problems you could see in personal or work settings. ![]() Related: How To Calculate the Percentage of a Number Types of percentage problems For example:įor a fraction, calculate the decimal first, then multiply the decimal by 100: If you're required to convert a decimal number like 0.57 into a percentage, multiply it by 100. However, if it's a fraction, like 3/20, first divide the numerator (the top number 3) by the denominator (the bottom number 20) to get the decimal. If the number to be converted to a percentage is a decimal like 0.57, you may not need to do anything before you go on to the next step. Turn the number into a decimal (if needed) The number's initial format will determine the next mathematical process carried out on the number.Ģ. For example, a decimal number is 0.57 a fraction is 3/20. The number to be converted to a percentage can either be in decimal or fraction form. Determine the format of the initial number The compound interest formula above can also be used for percentage decreases.1. It is predicted that their number will decrease by 12% each year. New value = 100 - percentage decrease × original valueĪt the end of 2003 there were 5000 members of a certain rare breed of animal remaining in the world. So if the £500 had been left in the bank for 9 years, the amount would have increased to: (100 + %change) no of years × original value The simple way to work out compound interest is to multiply the money that was put in the bank by n m, where n is (100 + percentage increase)/100 and m is the number of years the money is in the bank for, i.e: This phenomenon is known as compound interest. Every year, if the money is left sitting in the bank account, the amount of interest paid would increase each year. The interest, therefore, will be higher than the previous year (6% of £530 is more than 6% of £500). If in this example, the money was left in the bank for another year, the £530 would increase by 6%. In other words, the old value is £500 and it has been increased by 6%. Work out the amount in the bank after 1 year. £500 is put in a bank where there is 6% per annum interest. New value = 100 + percentage increase × original value It is the original value we wish to find, so the above formula is used. If the length is actually 17.6cm, what is the percentage error in Nicola's calculation?Īmish buys a stamp collection and makes a 35% profit by selling it for £2700. Nicola measures the length of her textbook as 20cm. By how much percent has the price increased by? The price of some apples is increased from 48p to 67p. ![]() % change = new value - original value × 100
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