so if there is an equation and it says for example: D + AB or U + ZS or something. if it has 2 lettera nzt to eachother would you multiply/add those 2 numbers togather? or make it one number. like if A is 4 and B is 5. would you multiply 4 x 5 or do 45??​

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! "?