Sarah took the advertising department from her company on a round trip to meet with a potential client. Including Sarah a total of 20 people took a trip. She was able to purchase coach tickets for 170and first class tickets for 1080.She used her total budget for airfare for the trip, which was 7260. How many first class tickets did she buy? How many coach tickets did she buy?

Abank manager wants to encourage new customers to open accounts with principals of at least $2 comma 500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?