Correct Answer: Option C

Explanation

Efficiency = \(\frac{M.A×100}{V.R}\)
V.R = 6
40= \(\frac{M.A×100}{6}\)
M.A = \(\frac{6 ×40}{100}\)
M.A = 2.4
M.A= \(\frac{L}{E}\)
E= \(\frac{120}{2.4}\)
E = 50

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