SOLUTION: PLEASE HELP AND EXPLAIN A mechanical device requires 420 J of work to do 230 J of work in lifting a crate . What is the efficiency of the device ?

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Question 1181934: PLEASE HELP AND EXPLAIN
A mechanical device requires 420 J of work to do 230 J of work in lifting a crate . What is the efficiency of the device ?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Eff=+%28Output%2FInput%29%2A100%
Eff=%28230%2F420%29%2A100+=+54.8% or rounded 55%