How to find Successor and Feasible Successor in EIGRP?

Successor is best path in EIGRP whereas Feasible Successor is backup path.Successor is calculated on the basis of metric.Path with lowest computed distance(FD) is called successor.We also have a feasibility condition for a path to be feasible successor.Let us take a topology:-

To understand this one must be familiar how FD(Feasible Distance),RD(Reported distance)  are calculated.