The regular price of a shirt is $15. Natalie bought it on sale for 0.9 times its regular price. Then the sale price was multiplied by 1.06 to include the tax.

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! "?