How is a wheel and axle used as both a force and speed multiplier?

What is the mechanical advantage of a machine that lifts a load of 75 N with an effort of 15 N?

In class I lever, the distance between the fulcrum and the load is 32 cm and then distance between the fulcrum and the effort is 64 cm. What is the MА?

In class II lever, the length of the effort is 200 cm and then length of the load arm is 50 сm. Calculate the MA.