How to Pass Numerical Reasoning Tests: A Step-by-Step Guide to Learning Key Numeracy Skills (Testing Series) by Smith Heidi
Author:Smith, Heidi [Smith, Heidi]
Language: eng
Format: epub, mobi
Publisher: Kogan Page
Published: 2013-05-03T00:00:00+00:00
£160
×
1 – 0.08
=
£160
×
0.92
= £147.20
Combining percentages
Percentage questions will often require that you complete the question in several stages. The questions are not difficult as long as you remember a couple of basic rules. First, remember that you cannot just combine all the percentages in a question and find the total percentage of the original whole. Second, always identify the original whole as the starting point.
Worked example
The average price of a London flat in 1970 was £40,000. By the end of the 1980s, the price had risen by 85%. By January 1992, house prices fell dramatically and the price of the same London flat, now beset with structural problems, fell by 40% on the December 1989 price. At how much more or less is the flat valued in 1992 than in 1970?
You are asked to find a new value following a percentage increase and then a percentage decrease. Increase the original whole (£40,000) by 85% (1 + 0.85) to find the December 1989 value:
40,000 × 1.85 = £74,000
New whole = £74,000
Decrease the new whole (£74,000) by 40% (1 – 0.4) to find the January 1992 value:
£74,000
×
(1 – 0.4)
=
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How to Pass Numerical Reasoning Tests: A Step-by-Step Guide to Learning Key Numeracy Skills (Testing Series) by Smith Heidi.mobi
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