In a binary Fe$-$C alloy what should be the carbon content to obtain $100\%$ pearlite$-$during

isothermal transformation from austenite at $600\backslash$deg C$.$ Assume that all phase boundaries are

straight lines in Fe$-$C binary. Some critical temperatures and compositions are $723\backslash$deg C$,910\backslash$deg C$,$

$1150\backslash$deg C$,0\mathrm{.}02\%$ C$,0\mathrm{.}77\%$ C$,2\mathrm{.}0\%$ C$,4\mathrm{.}3\%$ C and $6\mathrm{.}67\%$ C$.$