A negative percentage change that shows how much a quantity has decreased relative to its original value. It is calculated by finding the positive difference between the original and new values, dividing by the original value, and multiplying by 100.
From 'percentage' (Latin 'per centum') and 'decrease' from Latin 'decrescere' meaning 'to diminish.' The concept became mathematically formalized during the development of actuarial science in the 17th and 18th centuries.
Percentage decrease reveals the hidden mathematics of depreciation and decay! It's remarkable that the same formula that describes a 50% sale at a store also models half-life in radioactive decay and the cooling of coffee.
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