document.write( "Question 519460: A woman paid $21.56 (including sales tax) for a book that was marked 20% off. The sales tax was 8%. What was the cover price of the book? \n" ); document.write( "

Algebra.Com's Answer #345620 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+p+\"$ = cover price
\n" ); document.write( "Let $\"+t+\"$ = tax included
\n" ); document.write( "(1) $\"+21.56+-+t+=+p+-+.2p+\"$
\n" ); document.write( "(2) $\"+t+=+.08%2A%28+p+-+.2p%29+\"$
\n" ); document.write( "(2) $\"+t+=+.08%2A.8p+\"$
\n" ); document.write( "(2) $\"+t+=+.064p+\"$
\n" ); document.write( "By substitution:
\n" ); document.write( "(1) $\"+21.56+-+.064p+=+.8p+\"$
\n" ); document.write( "(1) $\"+.864p+=+21.56+\"$
\n" ); document.write( "(1) $\"+p+=+24.95+\"$
\n" ); document.write( "cover price is $24.95
\n" ); document.write( "----------------
\n" ); document.write( "check:
\n" ); document.write( "with 20% off:
\n" ); document.write( " $\"+19.96+\"$
\n" ); document.write( "plus 8% tax:
\n" ); document.write( " $\"+21.56+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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