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The heat loss through a window (U-value = 0.5) is 10 MMBTU/year. Calculate the payback period (in years) if Argon is filled in the window to increase the effective U-value of the window to 0.1429. Assume heating price to be $10/MMBTU and the cost for filling Argon is $20.A ) 0.7 years B ) -0.08 years C ) 0.21 years D ) 0.28 years
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