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E A [\widetilde {T} P_2] =\dfrac{D_c}{pm^{T_s+D_R}} [(c_m−c_s)p_mT_s−h_s(\dfrac{p_{s}t^{2}_{s}} {p_m} −p_st^{2}_{s}) −E[\widetilde {id}_s](T_R+p_st_s \dfrac{1}{D_c} −\dfrac{1}{p_m})−A_s \\ + (c_r−c_m)p_mT_s−h_m(np_mT_sT_R−\dfrac{n^2+n−2r−2}{2}T_RD_R−\dfrac{p^{2}_{s}t^{2}_{s}} {2p_m}) \\ −E[\widetilde {id}_m](\dfrac{p_mT_m−nD_R}{D_c}) −A_m+(cr_1−c_r)p_mT_s \\ −\dfrac{h_r}{2} (\dfrac{p^{2}_{m}T^{2}_s}{D_c} −2np_mT_sT_R−(2n+1)T_RD_R) \\ +{\dfrac{nc_{r1}D_cM^2}{2}+\dfrac{c_{r1}}{2}(p_mT_s−nD_R)(2M−T′)}E[\widetilde {Ire}]−E[\widetilde {id}r]T_R−A_r]