At $600$ C and $10\%Cu($percent based on mass$),$ the aluminum alloy has two phases: liquid phase and solid $$ phase. What is the percent mass vof each phase?

$41\%$ liquid and $59\%$ alpha

$59\%$ liquid and $41\%$ alpha

$3\mathrm{.}3\%$ liquid and $96\mathrm{.}7\%$ alpha

$96\mathrm{.}7\%$ liquid and $3\mathrm{.}3\%$ alpha