Two planet gears B & C having $30$ teeth each are attached to the arm E as shown in figure below

and gear $A$ is having $40$ teeth instead of $50,$ then find the number of revolutions made by the arm,

when:

i$)$ Gear A makes one revolution clockwise and D makes half a revolution anticlockwise.

ii$)$Gear A makes one revolution clockwise and D is stationary