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New number = original number – (decrease in percentage × number)
Example : The Cost of a mobile phone is Rs 15,000. Find the new price if there is a
decrease of 5%
New price = 15,000- 5 ×15,000= 15000- 750= 14,250
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Percentage of Increase or Decrease
A percent of increase (or decrease) = × 100%
Example :
The number of strawberry jelly rolls in stock went from 30 to 12 in one hour. What was
the percent decrease in the number of strawberry jelly rolls for that hour?
Solution:
The percent decrease in the number of strawberry jelly rolls for that hour was 60%.
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