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The heat loss through a window (U-value = 1) 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 0.1111. Assume heating price to be $10/MMBTU and the cost for filling Argon is $20.A ) 0.22 years B ) 0.2 years C ) -0.02 years D ) 1.8 years
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