$\delta = \dfrac{PL}{AE}$
$\delta = \delta_{cast \,\, iron} = \delta_{steel} = 0.8 \, \text{mm}$
$\delta_{cast \,\, iron} = \dfrac{P_{cast \, \, iron}(2000)}{[ \, \frac{1}{4} \pi (60^2 - 50^2) \, ] (100\,000)} = 0.8$
$P_{cast \, \, iron} = 11\,000 \pi \, \text{N}$
$\delta_{steel} = \dfrac{P_{steel}(2000)}{[ \, \frac{1}{4} \pi (50^2) \, ] (200\,000)} = 0.8$
$P_{steel} = 50\,000 \pi \, \text{N}$
$\Sigma F_V = 0$
$P = P_{cast \, \, iron} + P_{steel}$
$P = 11\,000 \pi + 50\,000 \pi$
$P = 61\,000 \pi \, \text{N}$
$P = 191.64 \, \text{kN}$ answer