Let the production unit range $20,000$ to $180,000$ normalized to $[0\mathrm{.}0,1\mathrm{.}0].$ Then using min$-$max method, $89,000$ is mapped toSelect one:a$\mathrm{.}0\mathrm{.}556$b$\mathrm{.}0\mathrm{.}431$c$\mathrm{.}0\mathrm{.}89$