In a batch of 280 water purifiers, 12 were found to be defective. what is the probability that a water purifier chosen at random will be defective? write the probability as a percent. round to the nearest tenth of a percent if necessary

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! "?