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Question
If 1 m3 = 750 kg for saw timber, find in which year was the difference in prices of saw timber and logs the least?
Options:
A .  1989
B .  1990
C .  1991
D .  1992
Answer: Option B
:
B
1 tonne =43=1.33m3
YEARSaw Timber(Price in Rs/Tonnes)Saw Timber(Price in Rs/Cubic meters)Logs price in(Rs/cubicmeters)Difference inprice19891291891990107.50157.501991139.75188.2519921511.25197.75
It is hence, clear that the difference is least in the year 1990.
Shortcut!
The beauty of the question is that the conversion need not even be done! Just observe the graph and you see the lines of Saw Timber & logs the closest to each other in 1990!

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