Your company is required to build a new water treatment plant in compliance with the new environmental regulations. You have two options to consider $-$ Option A and Option B$.$

Option A requires an initial investment of $$\mathrm{40},\mathrm{000}$ and will remain operational for $6$ years. The cost of maintenance for Plant A will be $$8,\mathrm{000}$ in year $1,$ $$\mathrm{14},\mathrm{000}$ in year $2,$ $$\mathrm{13},\mathrm{000}$ in year $3,$ $$\mathrm{12},\mathrm{000}$ in year $4,$ $$\mathrm{11},\mathrm{000}$ in year $5,$ and $$\mathrm{10},\mathrm{000}$ in year $\mathrm{6.}$

Option B$,$ on the other hand, requires an initial investment of $$\mathrm{20},\mathrm{000}$ and will remain operational for $3$ years. The maintenance cost of option B is $$7,\mathrm{000}$ in year $1,$ $$\mathrm{13},\mathrm{000}$ in year $2,$ and $$\mathrm{13},\mathrm{000}$ in year $\mathrm{3.}$



You need to decide which plant to select, keeping in mind that both options can be repeated.