Bill does 1500 j of work on a lever, which is a simple machine. the lever does 1350 j of work on a stone. what is the efficiency of the lever? 0.9% 1.1% 90% 111%

efficiency = 90%

Explanation:
Efficiency is used to compare between the input of the system and its output to know how much of the input computes into the output.
It is simply a ratio between the output and the input

For the given:
input to lever is the work Bob performs on it = 1500 J
output of lever = 1350 J

Therefore:
efficiency = (output / input) * 100
efficiency = (1350 / 1500) * 100
efficiency = 90%

Hope this helps :)

The answer is 90%

Hope this helps!!!