1) Write the amount in the question as a percentage of the original value.
2) Divide to find 1% of the original value.
3) Multiply by 100 to give the original value. (=100%).
Put into practice: A house increases in value by 20% to £72,000 find what it was worth before the rise.
1) An increase of 20% means £72,000 represents 120% of the original value .
2) Divide by 120 to find 1% of the original value
3) Then multiply by 100.
£72,000 =120%
/120
£600= 1%
X100 £60,000 = 100%
So the original value was £60,000
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