In the circuit, C$1=8\mathrm{.}7$ uF$,$ R$1=6$ k$,$ R$2=14$ k$,$ R$3=12$ k$,$ VS $=28$ V$.$ The capacitor is fully charged.

$1)$ What is the voltage across the capacitor C$1?($Units: V$)$

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$2)$ What is the charge stored in the capacitor C$1?($Units: C$)$