During the first month, Leo earned $450. In the second month, he earned $150 more than in the first month, so:
\[ \text{Earnings in second month} = 450 + 150 = 600 \]
Now, to find the total earnings over the two months, we sum the earnings from each month:
\[ \text{Total earnings} = \text{Earnings in first month} + \text{Earnings in second month} \] \[ \text{Total earnings} = 450 + 600 = 1050 \]
Therefore, Leo earned a total of $1050 during the first two months.