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Question 930994: A cross section of a standard or nominal board measures
11 1/2 in by 7 1/2 in. The rough board is 12in by 8in but is planed and dried to the finished size. What percent of the wood is removed in planing and drying?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! 11 1/2 = 11.5
7 1/2 = 7.5
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Old Area: 12 * 8 = 96 square inches
New Area: 11.5*7.5 = 86.25 square inches
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Percent Change = [(New - Old)/(Old)]*100
Percent Change = [(86.25- 96)/(86.25)]*100
Percent Change = (-0.11304)*100
Percent Change = -11.304 %
The percent change is negative to represent a percentage decrease.
So roughly 11.304% of the wood is removed.
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