The first thing to do is re-draw the circuit so you can understand it. V source on the left, + up. Next draw in elements closest to the source on the right, continue adding elements on right. Ignore the 50 ohm resistor, it will not be part of the problem. Solve network for current.
you could also try solving this with the node-voltage method. set the node in the left side to be you're ground node, then the voltage you are looking for will be the voltage at the top node.