Does anybody know how to do Reverse Percentages?
Answers:
Ideas for reverse percentage calculations
The value of a TV was increased by 10%. It has a new value of £440 after the 10% increase. What did it cost originally?
To solve this problem, we follow these logical steps.
STEP 1: Let us call the original value that we want to find 100%
STEP 2: After a 10% increase the new amount is therefore 110%
STEP 3: We know that this new 110% percent corresponds to a value of £440
STEP 4: Because 110% = £440
Divide by 110 so 1% = £4
STEP 5: The original cost was 100%.
100% = 100 × 1% = 100 × £4 = £400
Another way of doing it, using a calculator, is to do £440 ÷ 1.10
Dividing by 1.10 reverses the 10% to give the original cost
For other type of examples refer the web source
http://www.mathslearn.co.uk/notesperc2.h.
There are good examples with answers at:
http://www.trinity.nottingham.sch.uk/mat.
http://www.trinity.nottingham.sch.uk/mat. -- there ya go fill ya boots with this one-- it should answer all your questions x
give an example ?
if it is what i think, use the principle rules for constructing a percentage problem..
per cent
(PER represents the division..as in miles per hour {miles / hour}.
cent means 100.. so we put the percentage given over 100)
the words OF and IS are used .of means * (multiply).. is means the equal sign..
example .
36% of 2914 is ?
(36 / 100) * 2914 = ? ..... (.36 * 2914 = 1049.04)
1049.04 is 36% of 2914
The easiest methods, especially if you don't know how the percentage sign works on the calculator..
Add 15% to 100?: 100 x 1.15
Take 15% from 100?: 100 x 0.85 i.e 100 x (1.0-0.15)
What number + 15% = 115?: 115/1.15
What is 15% of 100?: 100 x 0.15
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