Markov Chains & Long-Run Behavior · Easy problem

A two-state chain has transition matrix $M = \begin{pmatrix} 0.6 & 0.1 \\ 0.4 & 0.9 \end{pmatrix}$, where $M_{ij}$ is the probability of moving to state $i$ from state $j$. The chain starts in state 1 with probability $p$ and in state 2 with probability $1 - p$. After one step the probability of being in state 1 is $0.3$. What is $p$? Express your answer as a decimal.