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Oops, your right. I had my Amount value wrong in the equation.
Here is the correct one:
(P)(B)=A
Percentage x Base = Amount
You need the percentage of decrease...it's unknown, Let it = X.
Your base amount is $2323.14.
And your Amount of the decrease is $1886.04.
sooooo,
2323.14(x) = 1886.04
Divide both sides by the coefficient of X. This leaves you with....
0.81184947958366693354683746997598
To change this to a percentage just multiply by 100.
81.184947958366693354683746997598%
or approximatly
81.2%
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