A stack of $20, $50, and $100 bills was retrieved as part of a police investigation. There were 41 more $50 bills than $100 bills. Also, the number of $20 bills was 9 times the number of $100 bills. If the total value of the money was 9970$, find the number of each type of bill.

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! "?