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If the work output of a simple machine is 40 J and the work input is 50 J, the percent efficiency is %.
A. 5/4
B. 10
C. 80
D. 90

80%

Explanation:

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

v=ir = 3x15 =45 v