While walking in his neighborhood, Donnie found 2 dimes and 2 pennies on the ground . What percent of a dollar did Donnie find ?
2 answers:
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The equation for exponential decay is 
, where <em>a</em> is the initial amount, <em>b</em> = 1 + <em>r</em> (the growth rate as a decimal number) and <em>x</em> is the number of time periods (in this case, minutes). Substituting the information we have:
. To the nearest tenth of a gram, this would be 1.0 grams.