What is the mechanical advantage of a lever that can lift a 100 N load with an input force of 20 N?

The mechanical advantage of a lever is calculated by dividing the output force (load) by the input force. In this case, the mechanical advantage would be 100 N (load) divided by 20 N (input force), which equals 5. Therefore, the lever in question has a mechanical advantage of 5, meaning it can lift the load 5 times easier than if the force was applied directly.