Answer:
[tex]\text{ \$630}[/tex]Explanation:
From the question, we have it that the securit deposit is one and a half months' rent
What this means is that we will add one month rent to half of the other month at a value of $420 per month
Mathematically, we have this as:
[tex]\begin{gathered} 420\text{ + }\frac{420}{2} \\ =\text{ 420 + 210 = \$630} \end{gathered}[/tex]