# How to find th percentage decrease and increase necessary to restore a quantity to its original value>?

If the original value has been increased by 10% what is the percentage decrease necessary to restore a quantity to its original value?

and

if the original value has been decreased by 80%, what is the percentage increase necessary to restore a quantity to its original value?

and

if the original value has been decreased by 80%, what is the percentage increase necessary to restore a quantity to its original value?

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