A bank manager wants to encourage new customers to open accounts with principals of at least 3000 $. 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 tthefirst month? Can the poster correctly say, "Open an account of $ 3000 and earn at least $ 10 interest in 1 month!"?