Show that this primal model is equivalent to the original

Question

Question: Derive the dual problem of the following risk model:

                       min Φ x'∑_cx
                             2

subject to               c'x ≥ R

                          Ax ≤ b,   x ≥ 0

where R is revenue, φ > 0, and all the other symbols retain the usual meaning. Show that this primal model is equivalent to the original Freund's specification.