Jane is a chemical engineer working in a processing division of a large semiconductor fabrication facility. She is tasked to order new furnaces for annealing indium, zinc, and gold contacts. A different furnace is used for each metal. Furnaces vary in price and have different operation temperatures, as shown in the table below:
Furnace
Price
Operation Temperature (F)
MTX 120
$150
50 to 250
MTX 150
$180
100 to 400
MTX 250
$250
100 to 600
MTX 350
$350
200 to 800
MTX 500 HT
$600
250 to 1,300
Jane wants to order three MTX 120 furnaces first. Then, she remembers that operation temperature of furnaces should be at least 50 K (degrees Kelvin) above annealing temperature.
Annealing temperatures are provided in the table below:
Metal
Annealing Temperature (C)
Gold
600
Indium
90
Zinc
250
What furnaces should Jane select to save money for the company? How can she explain her decision in the report she will submit to her manager?