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!"?