document.write( "Question 814958: What would be the formula for figuring out a percentage that as already been added to a total and you want to isolate the percentage already added?\r
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\n" ); document.write( "\n" ); document.write( "What was the original number (100) before taxes were added (13%)?\r
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Algebra.Com's Answer #490618 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( " C + .13C = Total
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document.write( " C(1+ .13)= Total
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document.write( "   C =  If tax = 7.5%, for ex:  C = 
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document.write( "   C = = $88.50  (rounded to the nearest penny) \n" );
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