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Time remaining: $27$ minutes $17$ seconds

Mr Ignas Cesokas, JM$4507$

Question $1)$ A machine has an input of $4,000$ watts and an output of $3,000$ watts. What is its efficiency?

a$)85\%$

b$)80\%$

c$)75\%$

d$)90\%$

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$51.$