document.write( "Question 684479: An elementary-school-age child wants to have a lemonade stand. She wants to sell each glass of lemonade for $0.25. She has determined that each glass of lemonade costs about $0.15 to make (for lemons and sugar). It costs her $20.00 for materials to make the lemonade stand. How many glasses of lemonade must she sell to break even? \n" ); document.write( "

Algebra.Com's Answer #424110 by josmiceli(19441) $\"\"$ $\"About$

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She breaks even when profit = 0
\n" ); document.write( "Let $\"+P+\"$ = profit
\n" ); document.write( "Let $\"+n+\"$ = number of glasses sold\r
\n" ); document.write( "\n" ); document.write( " $\"+P+=+.25n+-+.15n+-+20+\"$
\n" ); document.write( " $\"+P+=+.1n+-+20+\"$
\n" ); document.write( " $\"+P+=+0+\"$
\n" ); document.write( " $\"+.1n+-+20+=+0+\"$
\n" ); document.write( " $\"+.1n+=+20+\"$
\n" ); document.write( " $\"+n+=+200+\"$
\n" ); document.write( "She must sell 200 glasses to break even
\n" ); document.write( " \n" ); document.write( "

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