The municipal solid waste $\text{(MSW)}$ generated in a community $\text{(population =(100000)}$ is disposed on a $12 \times 10^4 \mathrm{m}^2$ landfill site, which can be filled to a total depth of $25 \mathrm{~m}$ $\text{(including soil cover)}$. Assume that $\text{MSW}$ is generated at a rate of $2.5 \mathrm{kg}$ per person per day and its compacted density is $800 \mathrm{~kg} / \mathrm{m}^3$. If the volumetric ratio of $\text{MSW}$ and soil cover is $5:1$, the useful life of the landfill site is _________ years $\text{(rounded off to the nearest integer)}$.
