c$.$ Welles thinks a sales rep might be motivated to work harder and sell $1,100$ units of Product B if the commission rate $($under the commission plan$)$ were increased to $10$ percent. If Welles is right $($and everything else stays the same$),$ would the higher commission rate be a good deal for Nanek?

Yes, it will result in a higher profit contribution.

No$,$ it will result in a lower profit contribution.

It makes no difference, profit contribution doesn't change.