document.write( "Question 1048509: The formula A = P(1 + r)2 is used to find the amount of money, A, in an account after P dollars have been invested in the account paying an annual interest rate, r, for 2 years. Find the interest rate r if $500 grows to $845 in 2 years. \n" ); document.write( "
Algebra.Com's Answer #664134 by jorel555(1290)\"\" \"About 
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845=500(1+r)²
\n" ); document.write( "845/500=(1+r)²
\n" ); document.write( "1.69=(1+r)²
\n" ); document.write( "1+r=1.3
\n" ); document.write( "r=30%. ☺☺☺☺
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