I am in need of assistance with the following problems in the provided picture. Please provide thorough responses that are easy to read and understand. The instructions are stated at the top of the page for your support. Thank you.

8. The amount of work obtained from a machine is always less than the amount of work put into it. This is because some of the work is lost due to friction. The efficiency of a machine can be calculated using the following formula: efficiency (%) = (work output / work input) x 100% a. A man expends 100 J of work to move a box up an b. A box weighing 1 N is pushed up an inclined plane that inclined plane. The amount of work produced is 80 J. is 5 m long. It takes a force of 75 N to push it to the top, which has a height of 3 m. c. Using a lever, a person applies 60 N of force and moves d. A person in a wheelchair exerts a force of 25 N to go up the lever 1 m. This moves a 200 N rock of the other end a ramp that is 10 m long. The weight of the person and by 0.2 m. wheelchair is 60 N and the height of the ramp is 3 m. e. A boy pushes a lever down 2 m with a force of 78 N, f. A pulley system operates with 40% efficiency. If the the box at the other end with a weight of 50 N moves up work put in is 200 J, how much useful work is produced? 2.5 m