OA is D, but I don't see how you can get the final cost from each of the statements.
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cost = k*t*l^2, where k is a constant.
1 and 2 are both sufficient.
1 - sufficient. k*0.2*4 = 160 + k*0.1*4. We can find k and hence the
cost.
2 - similar to 1, sufficient.
Hence D
