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Sav [38]
3 years ago
7

Can someone please help!!

Mathematics
1 answer:
svlad2 [7]3 years ago
6 0

let's say the total amount for 2011 was "x", so "x" is the 100%.

in 2012 it went down by 10% to 90, so 90 is really 100% - 10%, namely 90 is the 90% of "x".

so since we know that 90 is the 90%, what is "x"?


\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} x&100\\ 90&90 \end{array}\implies \cfrac{x}{90}=\cfrac{100}{90}\implies \cfrac{x}{90}=\cfrac{10}{9} \\\\\\ 9x=900\implies x=\cfrac{900}{9}\implies \boxed{x=100}

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