A savings account earns 1% simple interest annually for balances of $100 or less, 2% simple interest for balances greater than $100
and up to $500, and 3% simple interest for balances greater
than $500.

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. 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! "?