For purchasing a batch reactor, three alternatives $\mathrm{P}, \mathrm{Q}$ and $\mathrm{R}$ have emerged, as summarized in the table. For a compound interest rate of $10 \%$ per annum, choose the correct option that arranges the alternatives, in order, from the least expensive to the most expensive.
| $\text{P}$ | $\text{Q}$ | $\text{R}$ |
| Installed Cost (lakh rupees) | $15$ | $25$ | $35$ |
| Equipment Life (years) | $3$ | $5$ | $7$ |
| Maintenance Cost (lakh rupees per year) | $4$ | $3$ | $2$ |
- $\mathrm{P}, \mathrm{Q}, \mathrm{R}$
- $\text{R, P, Q}$
- $\text{R, Q, P}$
- $\text{Q, R, P}$