document.write( "Question 1119751: Emily needs to purchase a new air conditioner for the office. Model 1600A costs $950 to purchase and $32 per month to operate. Model 6070B, a more efficient unit, costs $1275 to purchase and $22 per month to operate.
\n" ); document.write( "a) After how many months will the total cost of both units be equal?
\n" ); document.write( "b) Which model will be the more cost effective if the life of both units is guaranteed for 10
\n" ); document.write( "years?
\n" ); document.write( " \n" ); document.write( "
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Emily needs to purchase a new air conditioner for the office. Model 1600A costs $950 to purchase and $32 per month to operate. Model 6070B, a more efficient unit, costs $1275 to purchase and $22 per month to operate.
\n" ); document.write( "a) After how many months will the total cost of both units be equal?
\n" ); document.write( "m = months
\n" ); document.write( "950 + 32m = 1275 + 22m
\n" ); document.write( "Solve for m
\n" ); document.write( "========
\n" ); document.write( "b) Which model will be the more cost effective if the life of both units is guaranteed for 10 years?
\n" ); document.write( "10 years = 120 months
\n" ); document.write( "950 + 32*120 for the 1600A
\n" ); document.write( "1275 + 22*120 for the 6070B
\n" ); document.write( " \n" ); document.write( "
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