document.write( "Question 965470: the salary of A is 20% below the salary of B and the salary of C is 56.25% greater than the salary of A.\r
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\n" ); document.write( "\n" ); document.write( "by how much % is the salary of B less than the salary of C.
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Algebra.Com's Answer #590152 by Theo(13342)\"\" \"About 
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the salary of A is 20% below the salary of B and the salary of C is 56.25% greater than the salary of A.\r
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\n" ); document.write( "\n" ); document.write( "by how much % is the salary of B less than the salary of C?\r
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\n" ); document.write( "\n" ); document.write( "salary of A is .8 * B.\r
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\n" ); document.write( "\n" ); document.write( "this is because 20% less than salary of B is equal to B - .20 * B which is equal to (1 - .2) * B which is equal to .8 * B.\r
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\n" ); document.write( "\n" ); document.write( "salary of C is 1.5625 * salary of A.\r
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\n" ); document.write( "\n" ); document.write( "this is because 56.25% greater than A is equal to A + .5625 * A which is equal to (1 + .5625) * A which is equal to 1.5625 * A.\r
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\n" ); document.write( "\n" ); document.write( "so you have:\r
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\n" ); document.write( "\n" ); document.write( "A = .8 * B
\n" ); document.write( "C = 1.5625 * A.\r
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\n" ); document.write( "\n" ); document.write( "in the equation of A = .8 * B, solve for B to get B = A / .8 which is the same as 1/.8 * A which simplifies to B = 1.25 * A. \r
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\n" ); document.write( "\n" ); document.write( "you now have:\r
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\n" ); document.write( "\n" ); document.write( "A = .8 * B
\n" ); document.write( "B = 1.25 * A
\n" ); document.write( "C = 1.5625 * A.\r
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\n" ); document.write( "\n" ); document.write( "you want to know what percent the salary of B is less than C.\r
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\n" ); document.write( "\n" ); document.write( "the formula for this would be:\r
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\n" ); document.write( "\n" ); document.write( "(C - B) / C * 100%\r
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\n" ); document.write( "\n" ); document.write( "since B = 1.25 * A and C = 1.5625 * A, this formula becomes:\r
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\n" ); document.write( "\n" ); document.write( "(C - B) / C * 100% = [(1.5625 * A - 1.25 * A) / (1.5625 * A)] * 100%\r
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\n" ); document.write( "\n" ); document.write( "The A in the denominator and the A in the numerator cancel out and you are left with:\r
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\n" ); document.write( "\n" ); document.write( "(C - B) / C * 100% = [(1.5625 - 1.25) / 1.5625] * 100%.\r
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\n" ); document.write( "\n" ); document.write( "sinplify this to get (C - B) / C * 100% = 20%.\r
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\n" ); document.write( "\n" ); document.write( "that's your solution.\r
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\n" ); document.write( "\n" ); document.write( "B is 20% less than C.\r
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\n" ); document.write( "\n" ); document.write( "to see if you're correct, give some values to A and B and C and see if this makes sense.\r
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\n" ); document.write( "\n" ); document.write( "let B = 1000
\n" ); document.write( "this means that A is equal to 800 because A is equal to 80% of B.
\n" ); document.write( "this means that C is equal to 1250 because 80% of 1250 is equal to 1000.\r
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\n" ); document.write( "\n" ); document.write( "if the numbers are correct, than C must be 56.25% greater than A.\r
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\n" ); document.write( "\n" ); document.write( "800 * 1.5625 is equal to 1250.\r
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\n" ); document.write( "\n" ); document.write( "the numbers check out so the solution appears to be good.\r
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\n" ); document.write( "\n" ); document.write( "i'd go with it.\r
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\n" ); document.write( "\n" ); document.write( "solution is that B is 20% less than C.\r
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