Answer :
She will lease out 21 apartments in the month of October.
We are given that a leading agent leases 15 apartments in the month of September.
Number of apartments in the month of September = 15.
Now, it is also given that she leases 40 % more apartment in the next month that is October.
Number of apartments in the month of October. = 15 + 40 % of 15
Number of apartments = 15 + 40 / 100 × 15
Number of apartments = 15 + 6
Number of apartments = 21 apartments.
Therefore, she will lease out 21 apartments in the month of October.
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