The given information is:
- Rate of depreciation 10%
- Price of the machine $18000
- It was sold after 3 years
We have to find what price it will fetch.
The value of the machine after 3 years is given by the following formula:
![Q=P(1-(r)/(100))^n](https://img.qammunity.org/2023/formulas/mathematics/college/ia3j4qtwaqdm2hs03776h4v97a6gt2if09.png)
Where P is the present value, r is the depreciation rate and n the number of years, so:
![\begin{gathered} Q=18000(1-(10)/(100))^3 \\ Q=18000(1-0.1)^3 \\ Q=18000(0.9)^3 \\ Q=18000(0.729) \\ Q=13122 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/b4ik61gt9y8sxepzrzt91n8tdsnfgsom49.png)
Thus, the machine will fetch 13122 after 3 years.
The answer is a. $13122