Please answer in EXCEL with Solver

This assignment is done in EXCEL. It is preferred to do all problems in same excel file. You should separate out into separate sheets. 1) A political scientist reveived a grant to find a research project on voting trends. The budget includes $3,200 for conducting door to door interviews on the day before an election. Undergraduate students, graduate students, and faculty members will be hired to conduct the interviews. Each undergraduate student will conduct 18 interviews for $100. Each graduate student will conduct 25 interviews for $150. Each faculty member will conduct 30 interviews for $200. Due to limited transportation facilities, no more than 20 interviewers can be hired. How many undergraduat students, graduate students, and faculty members should be hired in order to maximize the number interviews? Wha is the maximum number of interviews