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,
![s.i.=(P* R* T)/(100)](https://img.qammunity.org/2023/formulas/mathematics/college/85pv29su74an8hgpiaod7dtczgdnro1eq4.png)
Substitute the given values in the above expression.
![\begin{gathered} s\mathrm{}i\mathrm{}=(18000*9*219)/(100*365) \\ =972 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/bzhxhq8ubcn6a4qzsx6s83degim45lqs9o.png)
Thus, the interest Kusum got is 972 rupees.