document.write( "Question 1119732: 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" );
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