University department administers a survey, regarding a student satisfaction. Based on the survey results, department provides a confidence interval estimate of 60% to 80% for student satisfaction if the department which is to construct a confidence interval that more accurately represents the portion of student satisfaction, how should a design be altered

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Need solving this second acceleration problem.

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?