IMO D
From the question stem
Cost=K*T*L^2
K- a constant
T-thickness
L-Length
Given L=3, T=0.1, if we find K, we are done
1)K*0.2*4=K*0.1*4+160
we can find K, sufficient
2)K*0.1*9=K*0.1*4+200
again Sufficient
The cost of a square slab (GMAT Prep)
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Source: Beat The GMAT — Data Sufficiency |
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tohellandback
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