Given data:
The given principal is P=18,000.
The given rate of interest is r=9%.
The time from 14 january to 21 August is t=219 days.
The given time in year is T=219/365 year
The expression for the interest is,
[tex]s.i.=\frac{P\times R\times T}{100}[/tex]Substitute the given values in the above expression.
[tex]\begin{gathered} s\mathrm{}i\mathrm{}=\frac{18000\times9\times219}{100\times365} \\ =972 \end{gathered}[/tex]Thus, the interest Kusum got is 972 rupees.
