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In this unit we shall look at the meaning of percentages and carry out calculations involving percentages. We will also look at the use of the percentage button on calculators. In order to master the techniques explained here it is vital that you undertake plenty of practice exercises so that they become second nature. After reading this text, and/or viewing the video tutorial on this topic, you should be able to: • calculate a percentage of a given quantity; • increase or decrease a quantity by a given percentage; • find the original value of a quantity when it has been increased or decreased by a given percentage; • express one quantity as a percentage of another.
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