Q. The rate per kg of material P, Q, R & S are respectively ₹ 12,₹ 15,₹ 18 & ₹ 21. The input-output ratios of the material are 140%, 130%, 120% & 110% respectively. The most economical material for production is:
A. P
B. Q
C. R
D. S
Answer: P
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