Recognize constant percent growth or decay as evidence for an exponential model.
Convert percent decrease to decay factor
Problem
Identify the decay factor for a constant percent decrease of \(10\%\).
Big Picture
What this problem is really about
A decay factor describes the portion that remains after a loss, not the portion removed. We’ll convert the percent decrease to a decimal and subtract it from the original whole. Interpreting the result as a retained percentage, then applying it to a simple value, will check that the multiplier creates the stated decrease.
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