document.write( "Question 528471: Last month, Alex spent 40% of his salary on a laptop. He then spent 30% of it on his bills and saved the remaining $1200. What was his salary?\r
\n" ); document.write( "\n" ); document.write( "Can you please explain how to solve this? Thank you.
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Algebra.Com's Answer #349292 by oberobic(2304)\"\" \"About 
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He spent 70% of his salary and had $1200 left.
\n" ); document.write( "Let 'x' be his salary.
\n" ); document.write( "100%-70% = 30% left.
\n" ); document.write( "30%x = 1200
\n" ); document.write( ".3x = 1200
\n" ); document.write( "x = 4000
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\n" ); document.write( "Check the math.
\n" ); document.write( ".4*4000 = 1600
\n" ); document.write( ".3*4000 = 1200
\n" ); document.write( "4000 - 1600 -1200 = 1200
\n" ); document.write( "Correct.
\n" ); document.write( ".
\n" ); document.write( "Answer: His salary is $4000.
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\n" ); document.write( "Done.
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