During the design of a new process to manufacture nanocomposites, several alternative waste treatment processes are being considered. The base case is the main waste treatment process, and the options are modifications to the base case. Not all options are compatible with each other, and the economic data on the only possible combinations are as follows:

Case Capital Investment $($$million$)$Annual$,$ After$-$Tax Cash Flow $($$thousand$/$y$)$

Base $5\mathrm{.}0750$

Base $+$ option $15\mathrm{.}1770$

$25$

$5$

$2\mathrm{.}5/$y $0\mathrm{.}9/$y $2\mathrm{.}0/$y $2\mathrm{.}5/$y $2\mathrm{.}0/$y $3006\mathrm{.}5\%$ p$.$a$.$

Base $+$ option $1+$ option $25\mathrm{.}3790$

Base $+$ option $35\mathrm{.}2782$

Base $+$ option $1+$ option $35\mathrm{.}4810$

The nondiscounted, internal hurdle rate for investment is $14\%$ p$.$a$.,$ after tax. Which waste treatment process do you recommend?