# How to find the percentage decrease necessary to restore a quantity to its original value?

If the original value has been increased by 18% what percentage decrease is necessary to restore a quantity to its original value?

also

the profit was $3650 last year, but this year it decreased by 42%. what percentage must the profit increase next year to restore it to its original value?

also

the profit was $3650 last year, but this year it decreased by 42%. what percentage must the profit increase next year to restore it to its original value?

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