document.write( "Question 824667: [ A store pays $5.50 each for calculators it buys from a supplier, plus a delivery charge of $25 per order. If the store sells the calculators for $8 each, how many calculators must be ordered and sold to produce a profit of $80 ] \n" ); document.write( "
Algebra.Com's Answer #496656 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "the profit equation:
\n" ); document.write( "p = r - c
\n" ); document.write( "r = revenue
\n" ); document.write( "c = cost
\n" ); document.write( "x = number calculators bought and sold
\n" ); document.write( "---
\n" ); document.write( "p = r - c
\n" ); document.write( "p = 8x - (5.5x + 25)
\n" ); document.write( "p = 8x - 5.5x - 25
\n" ); document.write( "p = 2.5x - 25
\n" ); document.write( "---
\n" ); document.write( "for a profit of $80:
\n" ); document.write( "80 = 2.5x - 25
\n" ); document.write( "2.5x = 105
\n" ); document.write( "x = 105/2.5
\n" ); document.write( "x = 42
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "the store must purchase and sell 42 calculators
\n" ); document.write( "---
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