Given
"A_1=50000\\\\N=25\\\\i=0.07\\\\g=0.05"
therefore
"P=A_1[\\frac{1-(1+g)^N(1+I)^{-N}}{i-g}]\\\\P=50000[\\frac{1-(1+0.05)^{25}(1+0.07)^{-25}}{0.07-0.05}]\\\\=940167.22"
Benefit paid after 25 years
"A=50000\\\\N=25\\\\i=0.07"
Present value of retirement benefits
"=50000(P\/A,7\\%,25)\\\\=50000(11.654)\\\\=582700"
Additional saving"=940167.22-582700=357467"
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