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What effort will a machine of efficiency 90 app... - JAMB Physics 2013 Question

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?
A
80N
B
90N
C
100N
D
120N
correct option: c

M.A. = (\frac{Eff \times V.R.}{100})

M.A. = (\frac{90 \times 2}{100})

M.A. = 1.8

E = (\frac{L}{M.A.})

E = (\frac{180}{1.8})

E = 100N

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