The bank quote of 6% means that it will pay an interest rate of 6%/365 ≈ 0.0164384% per day. This earns an actual interest rate of (1 + 0.0164384%)365 − 1 ≈ 6.18% per annum. Therefore, each invested $100 grows to $106.18, thus earning $6.18 over the year.