The constraint is phrased as: Between 40% and 60% of the mail surveys should be sent to Association members.

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Chapter 4 Question 16 PART A 50M1+10M2 + 5M3+ 60N1 + 15N2 + 8N3 M1 M2 M3 N1 N2 N3 Limits Total Farmers 1 1 1 1 1 900 Face-to-Face 1 0 0 1 0 315 Phone 0 1 0 0 0 225 Min Lower Mail 0 0 1 0 0 1.13687E-14 (Cost in $) Members 1 1 0 0 450 Upper Mail 0 0 1 0 0 1.7053E-14 Cost ($) 2.4 2.5 2.8 0.2 0.25 0.2 s.t. Who/How to Survey 0.0 0.0 0.0 675.0 225.0 0.0 LHS Sign RHS Total Farmers 900 >= 900 Face-to-Face 675 >= 315 Phone 225 >= 225 Lower Mail 2.8E-14 >= 1.1E-14 Members 2.8E-14