$2.$ Which alternative is more cost$-$effective and by how much? $($ assume that any traceable fix costs can be avoided$)$

$3.$ What if Reisher can only avoid $186$ hours of engineering time and $5,050$ hours of setup time that are attributable to model $1?$ How does that affect the alternatives presented in requirement $2?$ Which alternative is more cost$-$effective and by how much?