document.write( "Question 1170855: 1. A garment store sells about 40 t-shirts per week at a price Php 100 each, 10 decrease in price,
\n" ); document.write( "the sale lady found out that 5 more t-shirt per week sold. What quadratic function in standard
\n" ); document.write( "for the models. The revenue form t-shirts sell. What price produce the maximum revenue?
\n" ); document.write( " With solutions:)
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Algebra.Com's Answer #795809 by Boreal(15235)\"\" \"About 
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this is 40+5x shirts sold at a price of 100-10x
\n" ); document.write( "the equation is -50x^2+100x+4000=f(x)
\n" ); document.write( "the maximum is at x=-b/2a or x=1
\n" ); document.write( "the price is 90 Php. and 45 shirts are sold for 4050 Php. revenue
\n" ); document.write( "100 and 40 gives 4000 Php.
\n" ); document.write( "80 and 50 gives 4000 Php.\r
\n" ); document.write( "\n" ); document.write( "90 Php.
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