How to Pass Numerical Reasoning by Heidi Smith

Author:Heidi Smith [Smith, Heidi]
Language: eng
Format: epub
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)

=

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.