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What is 20 percent of 250?
A. 40
B. 50
C. 60
D. 25
Correct Answer Is Option = 50
Notes / Explanation
Twenty per cent of two hundred and fifty is fifty, and this calculation provides a good opportunity to understand the idea of percentages, which is one of the most useful concepts in everyday mathematics. The word per cent means for each hundred, so that a percentage is a way of expressing a part of a whole in terms of how many parts there would be for every hundred. When we speak of twenty per cent of a quantity, we mean twenty parts out of every hundred parts of that quantity, and to find twenty per cent of a number we find what twenty parts out of every hundred of that number comes to. There are several ways to work out twenty per cent of two hundred and fifty. One straightforward method is to recognise that ten per cent of a number is found by taking a tenth of it, so that ten per cent of two hundred and fifty is twenty-five, and since twenty per cent is twice ten per cent, twenty per cent of two hundred and fifty is twice twenty-five, which is fifty. Another method is to turn the percentage into a fraction, since twenty per cent is the same as a fifth, and a fifth of two hundred and fifty is fifty. Both methods give the same answer of fifty. Percentages are extremely useful in a great many practical situations in everyday life. They are used to express discounts and increases in prices, so that a customer can work out how much is saved in a sale; they are used in the calculation of interest on money that is saved or borrowed; they are used to express marks and results in examinations; and they are used in describing proportions and changes of all kinds. Because percentages are so widely used, the ability to calculate them quickly and accurately is a very valuable skill, and questions involving percentages are very common in examinations. Understanding the meaning of a percentage and knowing simple methods for calculating percentages, such as finding ten per cent first and then building up, or recognising a percentage as a simple fraction, make such calculations quick and easy. For PPSC and other competitive examinations, the key points to remember are that twenty per cent of two hundred and fifty is fifty, that per cent means for each hundred, that a percentage of a number can be found by first finding ten per cent and building up or by recognising the percentage as a simple fraction such as a fifth, and that percentages are widely used in everyday life for discounts, interest, marks and proportions.
