Dean Jones says:

My interests will not be satisfied if you only accept 27% more students in each of your summer school sessions.  I anticipate heavy summer school enrollment and your contribution will be quite valuable.

Perhaps you would agree to teach 45% more students in each of your summer school sessions?

Your response:

1.  OK. I will agree to 45% more students.

2.  I will agree to 34% more students.

3.  I've gone as high as I can go.  I do not feel comfortable teaching more than 27% additional students in each summer session.