ABC Inc. wants to conduct some market research. They have the following requirements:

Conduct 1000 interviews

At least 400 households with children

At least 400 households without children

Evening interviews should be at least as many as day interviews

At least 40% of the interviews for households with children would be conducted in the evening.

At least 60% of the interviews for households without children would be conducted during evening.

Different types of interviews vary in cost.

Household with children during the day: $20

Household with children during the evening: $25

Household without children during the day: $18

Household without children during the evening: $20

A. What is the interview plan (how many interviews to conduct for each type) that would satisfy the research requirements at the minimum cost? Use solver to solve this problem. A check value for the total cost is $20320.

B. If the price for daytime interview with household with children is increased to $25, would this change your solution?

C. If the company requires 200 more interviews, how would this change the total cost?