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This is a students attempt at reverse percentages!

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My salary is now £21600 after a 6% increase.  What was my previous salary? (2 dp)
Solution:
21600 now represents 106%
£21600\106*100=£20377.26
Check:
20377.26\100*106=21600.00
(Or just 20377.26*1.06=21600)

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My favorite walk is now 116KM long having had a 9% decrease.  How long was the original walk?
Solution
1. 116 KM now represents 91% of the original walk
2. 116\91*100=127.42 KM
Check:
127.42\100*91=116 KM
(Or just 127.42*0.91=116)

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I bought my apartment 11 years ago.  Its value has increased by 36% to £112500 - what was the original selling price? (2 dp)?
Solution
1. £112500 now represents 136% (original 100% and the 36% increase)
2. 112500\136*100=82720.59
Answer: £82720.59
Check:  82720.59\100*136=£112500.00
(Or just *82720 by 1.36)

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My car has depreciated by 40% and is now worth £4600.00
What was the original price I paid (2 dp)?
Solution:
1. £4600 represents 60% of original price (40% depreciation)
2. 4600\60 *100 = original price
3. Answer: £7666.67
4. Check:  7666.67\100 *60=£4600.00 (Or just * £7666.67 by 0.6)!
The reverse of the reverse!