Variance of Fills Over a Binomial Number of Quotes

Out of $n=10$ resting quotes, each fills independently with probability $0.3$, so the number of fills $N$ is Binomial$(10,0.3)$. Each fill produces an i.i.d. PnL $X_i$ with $E[X_i]=2$ and $\mathrm{Var}(X_i)=9$, independent of which quotes fill. For the stopped sum $S_N=\sum_{i=1}^N X_i$, compute $\mathrm{Var}(S_N)$.