Answer:
Let the number be 100 Increase in the number = 20% of 100 =20 So, increased number = 100 + 20 = 120 Decrease in the number = 20% of 120 \[=\frac{20}{100}\times 120=24\] So, new number \[=\text{ }120\text{ }-\text{ }24\text{ }=\text{ }96\] Net decrease \[=\text{ }100\text{ }-\text{ }96\text{ }=\text{ }4\] Hence, net decrease per cent \[=\frac{4}{100}\times 100=4%\]
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