A rectangle is removed from the right hand corner of a square board. What is the area of the remaining board in square feet?

18 ft squared
40 ft squared
72 ft squared
104 ft squared

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! "?