take home quiz about simple machines?

Question

1.) a man uses a force of 40lbs to raise a load of 85lbs by 2ft with a pulley system. if he pulls a total of 10ft of rope through the system what is its efficiency?

*get the IMA first before solving the E

Answer 1

The IMA = 10/5 = 5
The efficiency is (2*85)/(10*40) = 42.5%