Final answer:
The leasing agent will earn $90 per month as the leasing commission. Upon lease execution and/or move-in, the leasing agent will earn $90.
Step-by-step explanation:
To calculate the leasing agent's commission, we need to find 10% of the monthly rent. In this case, since the rent for a property is $900 per month, the leasing agent will earn 10% of $900, which is $90 per month.
If the leasing agent earns this commission upon lease execution and/or move-in, then the agent will earn $90 when a lease agreement is signed and the tenant moves into the property.