\(F_{Fw,SK1}\geq\operatorname{}\left({F_{SR1,SK1}\left[\frac{C_{k,SR1}-C_{k,FW}}{C_{k,SR\_\max\ }-C_{k,FW}}-1\right]+\ldots+F_{SRN,SK1}\left[\frac{C_{k,SRN}-C_{k,FW}}{C_{k,SR\_\max\ }-C_{k,FW}}-1\right]+F}_{SK1}\left[1-\left(\frac{Z_{k,SK1}-C_{k,FW}}{C_{k,SR\_\max\ }-C_{k,FW}}\right)\right]\right)\) (3)