Question

a number is tirst increased by 20% and then decteased by 15% find the net increase or decrease percent

Answer 1

Original Number:

The original number is 100%

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Increased by 20%:

20% x 100% = 0.2 x100 = 20%

100% + 20% = 120%

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Decreased by 15%:

15% x 120 = 0.15 x 120 = 18%

120% - 18% = 102%

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Find Net Increase:

Net Increase = 102% - 100% = 2%

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Answer: There is a net increase of 2%.

Answer 2

Let the number be 100
So, after increase of 20% =100+20%of Rs 100
100+20/100*100=Rs 120.
As the same price is decreased by 15%.
The decrease = 120 - 15%of 100
120-15/100 * 100 = Rs 105
Change is decreased on the whole so the net decrease % = initial - final value
= 120 - 105 =15
Net decrease = 15%